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Need help with 450 Bushmaster loads.

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  • Wildcatter
    Member
    • May 2008
    • 161

    Thanks Randall, I feel better now, of course the medication helps...

    Looks like some of theses guys also want to help, the more the merrier, we're going to make history!

    Randall,

    These are pressure guns, I just need to figure out how to measure bolt thrust, in the 450 and any other cartridge I need, as well. I’m not sure what you mean by bring the firing pin coming in at an angle, but try again, sometimes my pea-brain farts. But, I was thinking of a sensor that looks more like a washer, with the firing pin that goes through the washer. The washer will be placed in the bolt face, right smack behind the case head face, in this fashion I can compare apples to apples or at least to an expectable standard, like for instance, what is the exact bolt thrust of the standard 5.56/223 factory and Blue-Pill fodder, compared to a high speed, modern loading, for the 450 Bushy. If I do this right, I will be able to use this particular pressure gun for my many other projects, changing barrels/calibers and were off to the races. What do you and our readers think? Seems that this has not been done or it’s a big secret, I mean, we love our little math models and they do accurately measure bolt thrust in bottle necked cartridges, but they tend to not apply to straight cases, hence, we don’t need anything else, right? Let me explain.

    Since the civil war, straight cartridges and their developments were laid to waste by smaller calibers, with necked cartridge cases using smokeless powders, never fully ringing out what the big bore straight cases could actually accomplish. This work today is relatively new to our world, to which I have played no small part in its developments.

    Bernoulli came up with a theorem in the late 1700’s that explained why I was seeing things that our canned little formulas, just weren’t explaining or were actually denying, what I was finding to be the opposite of what the formulas where saying should be happening. But, like the black powder 45-70 development, Bernoulli was lost in time or at least as it applies to my ballistic models. Hence the need to build a pressure gun that also measures bolt thrust. Seems positive field results, which are repeatable using the 450 Bushmaster, just aren’t enough.

    Interesting note; Bernoulli had a Mentor, which was one of my Grandfathers, who also discovered a Mathematical Theorem. Actually I’ve had two Grandfathers that have Theorems, after their names.

    But, I digress, common guys, what is the best way to build the definitive answer machine, the Nay-Sayers have had their say, let’s have ours? Pressure/Velocity/Accuracy guns are well understood; mine will look and function, not unlike them, with a twist for bolt thrust. Randall and I have a couple of ideas, what are yours?

    Safety First..t
    Last edited by Wildcatter; 02-05-2009, 5:15 AM.
    Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

    Comment

    • Siringo
      Member
      • Jul 2008
      • 114

      Back Thrust

      I would think that this would be a critical component in developing a cartridge for a particular weapons system. Theories are fine, but the only items we as reloaders have to rely on for pressure signs are primers and cases. Trouble with the 450 is the primers and cases are designed for 55K psi (or around there) and we can not really get a good read. I welcome real world tests versus models.

      From what I have read on the net, Remington with their new 30 RAR (based on the 450 case) is running that cartridge in the 55K psi range. They opt'd to use a modified AR10 bolt in the AR15 system to be able to handle the pressure/bolt thrust and keep folks from chambering the new cartridge in standard AR's. Do they have something like you are referring to or are they working off of formulas???? Are they just erring on the side of safety??

      Your design and thoughts Wildcatter seems logical to me. With the 450, I would like to be able to push a 300 gr to 350 gr bullet up to 2000 fps safely (in a 16 inch barrel). Maybe we can go faster, but all my years shooting a 45-70 at deer, this speed is more than enough for me.

      Comment

      • 17DoubleE
        Junior Member
        • Dec 2008
        • 3

        thrust measurement

        Hello Wildcatter,

        I've been reading on this forum since about the time of page 5 or so and have enjoyed and appreciate all the sharing of information here. I've got a 16" 450 Bushmaster and am hooked just like the rest of you! I think it'd be great to have the data you're proposing to take. Congrats on your development's production status!

        Would the washer shaped sensor be a peizo device? I don't know what the force limitations of these type of sensors are but they do have a rapid response. I imagine idealy that the measurement device would not change physical dimension during the measurement. Would copper crushers work for this task? I don't know if they typically crush only a couple of thousandths or if it's more than that. Load cells come to mind but maybe they lack the rapid response needed for this application.

        I suppose the sensing device could be located behind the locking lugs, etc. but then the added mass of the bolt would to some degree change the measurement result.

        Sounds like a good experiment and a fun machining opportunity!

        Comment

        • Wildcatter
          Member
          • May 2008
          • 161

          Originally posted by Siringo
          I would think that this would be a critical component in developing a cartridge for a particular weapons system. Theories are fine, but the only items we as reloaders have to rely on for pressure signs are primers and cases. Trouble with the 450 is the primers and cases are designed for 55K psi (or around there) and we can not really get a good read. I welcome real world tests versus models.

          From what I have read on the net, Remington with their new 30 RAR (based on the 450 case) is running that cartridge in the 55K psi range. They opt'd to use a modified AR10 bolt in the AR15 system to be able to handle the pressure/bolt thrust and keep folks from chambering the new cartridge in standard AR's. Do they have something like you are referring to or are they working off of formulas???? Are they just erring on the side of safety??

          Your design and thoughts Wildcatter seems logical to me. With the 450, I would like to be able to push a 300 gr to 350 gr bullet up to 2000 fps safely (in a 16 inch barrel). Maybe we can go faster, but all my years shooting a 45-70 at deer, this speed is more than enough for me.
          No, they are doing real world test for pressure, with a pressure gun, bringing the psi up to 55k (blue pills test rounds are in the 85k+ area)and then doing the SOCOM test of 6000rds. If it don't quit or break after 6000rds, the ARMY says its good to go. As for the modified bolt, I heard that they are still using the AR15 Barrel extension, so that makes the bolt more like the 450's, if this is true, I'll call to find out.

          Pushing the 300/350 bullets to 2000fps,...all I can say is there are safe loads that will do that reliably and pass the Gov test, but I'm ah skairt to say just now what they are(wait until I get up and running, then I will do a tell all), because somebody will duplicate the load with mud in their barrel or worst and then when they come to get me I'm going to tell them my name is Randall..wink..

          Safety First..t
          Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

          Comment

          • dfree
            Junior Member
            • Jan 2009
            • 7

            hey everyone

            new here trying to post not working maybe this time went into withdrawals last few days dies on the way factory crimp dies showed up today modified the crimp and shortened the collet and die body to match the 450bcase length theres some great things happening here. hope to figure out how to post soon the wheels turn slow but they do turn

            Comment

            • dfree
              Junior Member
              • Jan 2009
              • 7

              wildcatter

              rifleshooter has an article about the 30 rar it says they are using a modified ar-10 bolt with a .492 rim diameter and 55,ooo psi

              never thought I'd shoot a cast bullet but 450 boomer has got me intrigued I'll watch and learn the modified lee crimper didnt do much good on a factory case when cycling your first round out of the mag it needs a crimp groove. Ill know more when I get to the property to shoot my gun when shot from a lead slead will string every round up the target accept one. Im thiniking its ether the first round out of the mag or the last. as for the stringing I think its from the progressive recoil on each round I'll know more when I get back to the gravel pit. 10 degrees up here in ny today gotta love it

              Comment

              • Wildcatter
                Member
                • May 2008
                • 161

                Shoot'em up Dfree and welcome, Boomer sure has a way of piquing your interest, doesn't he?

                Safety First..t
                Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

                Comment

                • Wildcatter
                  Member
                  • May 2008
                  • 161

                  Originally posted by 17DoubleE
                  Hello Wildcatter,

                  I've been reading on this forum since about the time of page 5 or so and have enjoyed and appreciate all the sharing of information here. I've got a 16" 450 Bushmaster and am hooked just like the rest of you! I think it'd be great to have the data you're proposing to take. Congrats on your development's production status!

                  Would the washer shaped sensor be a peizo device? I don't know what the force limitations of these type of sensors are but they do have a rapid response. I imagine idealy that the measurement device would not change physical dimension during the measurement. Would copper crushers work for this task? I don't know if they typically crush only a couple of thousandths or if it's more than that. Load cells come to mind but maybe they lack the rapid response needed for this application.

                  I suppose the sensing device could be located behind the locking lugs, etc. but then the added mass of the bolt would to some degree change the measurement result.

                  Sounds like a good experiment and a fun machining opportunity!
                  And welcome to the 17DE, I can smell the cordite on you from here.. Or is that new after shave lotion called au-to-shooz'em!!..Yup the sensor I propose will be piezoelectric. No locking lugs, just a bolt block, Falling Block style. I suppose I'll relieve the action for the sensor, insert the cartridge into the barrel and then, maybe something like, screw the barrel in, coming up to a tork number, so that I can keep everything, samey-samey, between the 450 and the 223 and any other cartridge I choose. Now, I'm only thinking out loud here, because the barrel in a standard pressure gun just pins in, which I could keep if I could guarantee the same exact head-space for each of the cartridges...what am I missing gents?

                  Safety First..t
                  Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

                  Comment

                  • 450BOOMER
                    Junior Member
                    • Dec 2008
                    • 32

                    Originally posted by Wildcatter
                    Yup the sensor I propose will be piezoelectric. No locking lugs, just a bolt block, Falling Block style. I suppose I'll relieve the action for the sensor, insert the cartridge into the barrel and then, maybe something like, screw the barrel in, coming up to a tork number, so that I can keep everything, samey-samey, between the 450 and the 223 and any other cartridge I choose. Now, I'm only thinking out loud here, because the barrel in a standard pressure gun just pins in, which I could keep if I could guarantee the same exact head-space for each of the cartridges...what am I missing gents?

                    Safety First..t
                    OK,

                    Now I've got a much better Idea about your test gun; I was wondering how you were going to get wires attached to a sensor to stay on an AR style bolt... a falling block style rifle could be fitted with a sensor mounted in the falling block to measure compression and another sensor on the action to measure action stress (stretch).

                    Another test vehicle could be a Thompson Center Encore or Contender. The bull barrels could be swapped easily and the case head thrust sensor could be mounted in the removable breech block. A 45 Colt barrel could be re-chambered and 223 factory barrels are available. Maybe a barrel could be sacrificed to make a switch barrel fixture to mount AR barrels into the frame.

                    Case head thrust has always been an issue of concern with Contender frames and many a frame has been stretched with a 223 barrel and lubed cases. TC gunsmiths are well versed in what cartridges case head thrust can be an issue with... straight wall chamberings like the 450b, 45-70, 38-55, 375 Winchester, 45 Colt, 44 Magnum, etc. rarely cause problems.

                    Are you going to compare chrome plated chamber/bores to un-plated chamber/bores? It would be interesting to see if there's a difference in case head thrust between the two.

                    The Encore is so strong I don't believe you can break one.

                    Have fun,

                    Boomer
                    Only calibers starting with a 4 or larger are interesting.

                    Comment

                    • MudBug
                      Junior Member
                      • Apr 2008
                      • 34

                      Anyone else see THIS
                      450Bushmaster.net

                      Comment

                      • Wildcatter
                        Member
                        • May 2008
                        • 161

                        Originally posted by 450BOOMER


                        ..."Another test vehicle could be a Thompson Center Encore or Contender. The bull barrels could be swapped easily and the case head thrust sensor could be mounted in the removable breech block"....

                        ..."Are you going to compare chrome plated chamber/bores to un-plated chamber/bores? It would be interesting to see if there's a difference in case head thrust between the two"....

                        Boomer
                        Your ideas about using already existing shooting irons is a great one and sure would keep the cost down ALLOT. The only problem is with the gun I will be building for the various cartridges are many and some will be measured over 100,000psi. At those levels brass melts and is easier to remove from a barrel chamber, with a reamer, than the use of a scalpel in taking pieces of receiver out of my head... I love your idea though, if I were only going to use it at more normal pressures and if fact, now that you say it, your gun would be great out on the range in a more mobile use, with more normal pressures, now I want one of those too..

                        This idea of testing chrome barrels to non-chrome is a wonderful idea and I will do that. Now, young man, you've got some more ideas, keep them coming and to you our most trusted "Comrades in Cordite Burning", you want to see results from things you've been thinking about too, let's hear about them. When I get fully up and running in the new shops, send me your loads and provided there aren't hundreds of thousands of them, I'll give you a sit-rep on them, that we can all share.

                        "WE" together are going to fully ring out the 450 Bushmaster and it's amazing qualities!

                        Safety First..t
                        Last edited by Wildcatter; 02-09-2009, 7:33 AM.
                        Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

                        Comment

                        • Wildcatter
                          Member
                          • May 2008
                          • 161

                          Need a little help here..

                          I have been searching the net for this data, to no avail. The Speed of Published Factory 458Win-Mag 500gr bullets is 2040FPS from a 24” barrel (I know we can load them up some, but I need factory specs.). I too can guess that if I shorten the barrel to 20” the speed drop should be about 25-50FPS/inch (or something like 100-200fps drop), but I’m looking for Empirical Data, like from someone who actually has one and chronographed this factory loading from a 20” barrel I don’t want to guess. I’m really hoping not to cut down my buddies 26”er, just to find out (which BTW is a 452 barrel shooting 458 ammo reportedly with no ill effects , and shooting .452/230 gainers faster than Photon-Torpedoes )..

                          Safety First..t
                          Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

                          Comment

                          • jagermaster
                            Junior Member
                            • May 2008
                            • 59

                            Originally posted by Wildcatter
                            Need a little help here..

                            and shooting .452/230 gainers faster than Photon-Torpedoes )..

                            Safety First..t


                            Photon Torpedoes! You crack me up sometimes

                            Comment

                            • Wildcatter
                              Member
                              • May 2008
                              • 161

                              Originally posted by jagermaster
                              Photon Torpedoes! You crack me up sometimes
                              CAPTAIN JAGER!! CAPTAIN JAGER!!!!.."SHE'S CRACKING-UP CAPTAIN"..."I CAN NOT HOLD HER ANY LONGER"!!!
                              Animal Rights Activist do indeed taste like Chicken, which is why I always carry extra Barbecue Sauce and what brand of Barbecue Sauce do we use? Why of course it's "Bulls Eye" brand for me..sigpic BENEFACTOR MEMBER

                              Comment

                              • Siringo
                                Member
                                • Jul 2008
                                • 114

                                Crazy thought

                                Your Fired Chief Engineer Wildcatter! (I think that is was Kirk said to Scotty)

                                While perusing Cabelas, I was in the muzzleloading section and saw some 45 caliber sabots with 200 grain hornady sst bullets in them. Hummmm! I bought the pack and assembled a dummy round. Feeds from the mag. I am a little reluctant to shoot these, but Savage has a muzzleloader that shoots these sabots with smokeless powder and they are using the same type of powders we do. MMP sabots makes them for 45 caliber that hold 40 caliber bullets as well as 357. Whow! More versitality with the 450. Wouldn't that be cool if we could shoot 35 Remington bullets and the 40 caliber sst. With the ballistic coefficient of the 40 caliber at 2500 fps, this would be a 300 yard round.

                                The petals of the sabot would protrude past the end of the case the amount of free bore in the chamber or slightly less. This would be like the old Remington 22 caliber load for the '06 and 30-30, accelerators. Our modern form of paper patch bullets.

                                Comment

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