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  #1  
Old 09-21-2018, 9:47 PM
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Default .300 Win Mag velocity concerns

I took my new CA ridgeline out last weekend for the first time to brake the barrel in and collect some data. my brake in procedure was 3 shots and clean, 3 shots and clean and so on. chronograph is a pro chrono 10 feet in front of the muzzle. The load is a 215 Berger .030 off the lands, 76.6 grs. of H1000, a federal 210M primer in new Sig brass. From other data found on the internet and else where, I figured I should be in the range of 2875 and no more than 2950 fps, also My ES is 42 and SD is 11. There is Zero signs of pressure, bolt lift is good, primers look good and no extractor marks. Should I be worried? Any reason I should back off?

Forgot to add that my average velocity is 3047fps
Richard
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Last edited by hntnnut; 09-22-2018 at 8:12 AM..
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Old 09-22-2018, 2:24 AM
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My data shows you are backed off already, I'd start loading for accuracy
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Old 09-22-2018, 4:40 AM
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first you do not mention what your actually velocity is just where you think you should be.

next you should be running large rifle mag primers not standard LRPs and that is probably part of the high ESs...another cause may be new brass.

if your looking for more speed you should try reloader 26....when i was shooting a 300wm i could not get the velocities i was looking for before high pressures with H1000...i shot RL-22 and 210g SMKs at 2920 out of 26 and 28" shilen barrels.
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Old 09-22-2018, 5:26 AM
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No he should not be running mag primers. That is not the cause of his high es.
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Old 09-22-2018, 6:47 AM
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Quote:
Originally Posted by J-cat View Post
No he should not be running mag primers. That is not the cause of his high es.
Curious. Why not the mag primer then?
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Old 09-22-2018, 7:48 AM
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Because mag primers have proven to be unnecessary with H1000 in the .300WM. You want the mildest primer you can get away with for best accuracy. Our military’s MK248 Mod1 ammo uses H1000 and a FC210M primer.
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Old 09-22-2018, 8:10 AM
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Shoot for got to state my average velocity is 3047 fps. The high velocity was why I wrote this in the first place.


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Old 09-22-2018, 8:47 AM
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Your chrono is not all that accurate depending on where the light source is. You should be around 2950 with that load assuming you have a 24”+ barrel.
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Old 09-22-2018, 2:56 PM
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Default .300 Win Mag velocity concerns

Quote:
Originally Posted by J-cat View Post
No he should not be running mag primers. That is not the cause of his high es.


im not trying to argue but what is it then? ive loaded and shot thousands of 300wm rounds and every time i ran LRP it caused issues.

also even with a 26" barrel was NEVER over 3000fps or 2950fps with 76.5g of H1000 which was hot in 3 of the barrels i shot....75.5g of RL-22 was only 2925 with 210g SMKs.

Sorry I meant to put 73.5g of RL-22 not 75.5g.

Last edited by longrange1; 09-22-2018 at 3:54 PM..
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Old 09-22-2018, 4:48 PM
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His high ES is caused by an incompatible combination of brass, charge weight, and OAL. It is not caused by the FC210 primer.

Not all standard LR primers are the same. 210’s and H1000 are so compatible it’s like they were made for one another.
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Old 09-22-2018, 4:51 PM
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I run 77.5grs with 208’s in Hornady brass @ 3.660” in a 27” barrel and get 2950 FPS with single digit ES. Hornady brass weighs 233-242grs depending on the lot. I dunno what SIG brass weighs or it’s capacity.
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Old 09-23-2018, 3:24 AM
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Quote:
Originally Posted by J-cat View Post
His high ES is caused by an incompatible combination of brass, charge weight, and OAL. It is not caused by the FC210 primer.

Not all standard LR primers are the same. 210’s and H1000 are so compatible it’s like they were made for one another.
id be willing to bet if he ran everything the same and used a CCI250 primer his ESs would be lower. i agree its a combination of things but if you think a primer can not cause high ESs your wrong!

also in 4yrs and 3.5 barrels i never had a load in my 300wm that was in the single digits...teens to low doubles was the norm.

Quote:
Originally Posted by J-cat View Post
I run 77.5grs with 208’s in Hornady brass @ 3.660” in a 27” barrel and get 2950 FPS with single digit ES. Hornady brass weighs 233-242grs depending on the lot. I dunno what SIG brass weighs or it’s capacity.
so your running 1g more powder than the OP out of a 27" barrel and your at 2950 so how could the OP be running a heavier bullet with less powder and most likely out of a shorter barrel and be at 2950?

to the OP...

your chrony is F'd up theres no way your at 3047 with that load.
i know a little bit about primers...i did a LOT of primer testing about 5yrs ago and the CCI250s were the mildest of the MAG primers.

get a better chrony or set yours up in a card board box without the sun shade at 15 feet not 10 feet and try the CCI250s.
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Old 09-23-2018, 6:51 AM
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Tighter chamber, different barrel, possibly heavier case with less volume, that’s how. Stop arguing the primer issue. You’re wrong.
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Old 09-23-2018, 2:07 PM
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Interesting to know on the primers, I hadn't heard that standard LR primers can Ben used with H1000 in .300 WM so I'll have to try in the future. I'm not even close to this point with my rifle but am taking notes.
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Old 09-23-2018, 2:47 PM
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Quote:
Originally Posted by J-cat View Post
Tighter chamber, different barrel, possibly heavier case with less volume, that’s how. Stop arguing the primer issue. You’re wrong.


LOL ok.


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  #16  
Old 09-23-2018, 3:40 PM
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Quote:
Originally Posted by MrElectric03 View Post
Interesting to know on the primers, I hadn't heard that standard LR primers can Ben used with H1000 in .300 WM so I'll have to try in the future. I'm not even close to this point with my rifle but am taking notes.
https://forum.snipershide.com/thread...8-mod-1.17639/

Goto p5
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Old 09-23-2018, 4:11 PM
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Old 09-23-2018, 6:34 PM
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What is on post 5 that we are supposed to see?
And if you don't think primers affect extreme spread you have never used a chronograph ever.
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Old 09-23-2018, 6:47 PM
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Page 5

Please don’t insinuate I don’t use a chronograph. I shoot 99% of my shots through a chronograph, you land chaser.
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Old 09-24-2018, 3:25 AM
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Originally Posted by J-cat View Post
Page 5

Please don’t insinuate I don’t use a chronograph. I shoot 99% of my shots through a chronograph, you land chaser.
what type of shooting do you do and what type of chrony do you have that you shoot 99% of your loads through a chronograph?

and whats a land chaser?
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Old 09-24-2018, 8:37 AM
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How many shots in a string are you running when you check for ES? The numbers I posted were for a 26 shot string. Also could cleaning every 3rd shot have an affect on ES?


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Old 09-24-2018, 8:43 AM
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Also as far as primers go I had planned on running 215Ms as that seemed to be the general consensus for a go-to primer with the 215 hybrids but couldn't find any at the time. I found nothing negative about using 210Ms and had 5000 of those on hand so went with those.

Richard
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  #23  
Old 09-24-2018, 9:02 AM
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Richard
Primers are a tuning tool used when you reach a node and your extreme spread isn't what it should be.
On my cell phone there was no page 5 only a post 5 and that doesn't matter anyway.
If the load has a small extreme spread and the accuracy your after it's a good primer.
If the extreme spread is high and the accuracy isn't up to expectations primers at $4 a hundred or the cheapest tuning tool you have available.
When chronographing for extreme spread you pace your shots incrementally with regards to time and a five shot string is good enough.
If you clean your barrel your velocity will drop 35-125 FPS for one to two shots so don't clean or if you need to clean shoot 3 shots before you resume chronographing.

J-cat
Like I said no page 5 and that entire thread was useless drivel you water catcher.
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Old 09-24-2018, 9:55 AM
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Quote:
Originally Posted by LynnJr View Post
Richard
Primers are a tuning tool used when you reach a node and your extreme spread isn't what it should be.
On my cell phone there was no page 5 only a post 5 and that doesn't matter anyway.
If the load has a small extreme spread and the accuracy your after it's a good primer.
If the extreme spread is high and the accuracy isn't up to expectations primers at $4 a hundred or the cheapest tuning tool you have available.
When chronographing for extreme spread you pace your shots incrementally with regards to time and a five shot string is good enough.
If you clean your barrel your velocity will drop 35-125 FPS for one to two shots so don't clean or if you need to clean shoot 3 shots before you resume chronographing.

J-cat
Like I said no page 5 and that entire thread was useless drivel you water catcher.
Thanks I was just cleaning every 3 for barrel break in. accuracy was getting pretty good near the end of my barrel brake in session. started out in the .75"-1" inch range and after 50 rounds was in the .3"-.5" range.



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Old 09-24-2018, 10:19 AM
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Quote:
Originally Posted by LynnJr View Post
What is on post 5 that we are supposed to see?
And if you don't think primers affect extreme spread you have never used a chronograph ever.
Dang, for a minute I thought LynnJr was referring to my post. Looks like it was J-cat's answer that had him reply. I was simply curious to the primer question. That, I believe has been settled. I think.
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Old 09-24-2018, 11:42 AM
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Quote:
Originally Posted by LynnJr View Post
Richard
Primers are a tuning tool used when you reach a node and your extreme spread isn't what it should be.
On my cell phone there was no page 5 only a post 5 and that doesn't matter anyway.
If the load has a small extreme spread and the accuracy your after it's a good primer.
If the extreme spread is high and the accuracy isn't up to expectations primers at $4 a hundred or the cheapest tuning tool you have available.
When chronographing for extreme spread you pace your shots incrementally with regards to time and a five shot string is good enough.
If you clean your barrel your velocity will drop 35-125 FPS for one to two shots so don't clean or if you need to clean shoot 3 shots before you resume chronographing.

J-cat
Like I said no page 5 and that entire thread was useless drivel you water catcher.
It useless to a person who lacks in reading comprehension.
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Old 09-24-2018, 6:41 PM
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and whats a land chaser?
A person who either breech seats or constantly is adjusting seating length to keep the bullets into the lands the same amount.
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Old 09-24-2018, 8:46 PM
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A person who either breech seats or constantly is adjusting seating length to keep the bullets into the lands the same amount.
Eeeeewwwwwww.
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Old 09-25-2018, 3:14 AM
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Quote:
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A person who either breech seats or constantly is adjusting seating length to keep the bullets into the lands the same amount.
thanks...not even close to what i was thinking LOL.
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Old 09-25-2018, 6:11 AM
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Eeeeewwwwwww.
Lol!
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Old 09-25-2018, 9:57 AM
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Eeeeewwwwwww.
Blood is a natural lubricant.
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Old 10-01-2018, 7:09 AM
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Wouldn't that be a "Lands Chaser" or do J-Cats barrels only have one?

My reading comprehension is fine it's your lack of knowledge that makes you think primers have no affect.
Since you shoot 99% of your loads across a chronograph those that actually know what happens with a primer are lolroflmao.
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Old 10-01-2018, 1:54 PM
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I never said primers don’t have an effect, you bullet seater out too farrer.
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Old 10-01-2018, 2:17 PM
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Tell us what affect YOU SEE inquiring minds want to know what exactly that is.
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Old 10-01-2018, 4:35 PM
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Please read and understand post #10.

*Your suggestion to foul up the bore is good too.
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