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Centerfire Rifles - Manually Operated Lever action, bolt action or other non gas operated centerfire rifles. |
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#1
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Bedding a chassis gun
Bought a mdt chassis for my long range rifle. I’ve got various answers on beddingvto the chassis. I say both action and scope base should both be bedred. I’m hearingbpeople say no on the action to chassis. Thoughts and opinions??
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Why is everything good???? Illegal, Immoral, fattening??? |
#3
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this raises a lot of questions for me...
first what make/caliber of gun/chassis are we talking about? custom? factory? have you reached the point that YOU can shoot better than your gun can? do you hand load? if yes where are ESs or SDs at on your hand loads? theres more but these 3 should be more than enough to answer your question. |
#4
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Why is everything good???? Illegal, Immoral, fattening??? |
#5
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Make one trip.
shoot it first with match ammo. Which savage model did you buy ? I have a few savage rifles. Only my Stealth will shoot factory Hornaday 140 match in a .05 moa group at 100yds. I have to reload for the others. Or it's 2 inch group at 100 yds.
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Been gone too long. It's been 15 to 20 years since i had to shelf my guns. Those early years sucked. I really miss the good old Pomona Gun Shows. I'm Back. |
#6
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Stand the gun up so the butt is on the table and the muzzle points to the ceiling. Loosen and tighten the rear action screw and watch the indicator. If the indicator is moving more than a couple thousandths, the chassis should be bedded. I have yet to find ANY chassis that can pass this test. My bedded stocks move less than a thousandth. Unbedded chassis usually move between 50 and 150 thousandths. I have seen chassis that bend the reciever so much that the bolt binds in the receiver. This video shows the gun horizontal but I get better test results with the gun vertical.
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Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. Last edited by ar15barrels; 04-24-2019 at 9:21 AM.. |
#7
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People like to believe that, but actual testing of receiver deflection shows otherwise.
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#8
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__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#9
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I've got an FN SPR that used to sit in the original A1 stock that was bedded and a reliable .5 moa gun. I switched over to an XLR Evolution and groups went to 1 moa consistently. I called XLR and they said doesn't need to be bedded, need to redo load development, work on my technique with chassis, blah blah blah. Could never get it to group like before. I ended up bedding it myself with JB Weld at the two action screw contact points. Doesn't look like a professional bedding job, but restored accuracy to its former state. I would just do it regardless for ease of mind.
Went from this: To This: Last edited by Mike402; 04-24-2019 at 9:45 AM.. |
#10
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__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#12
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Is the deflection due to the inconsistency of the receiver machining dimensions more than the chassis machining issues?
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#13
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It's simply not possible to get support behind the rear action screw when you have no contact in the middle of the bottom of the receiver. So with the tang unsupported and hanging about 1/2" to 3/4" behind the V block contact points, the rear of the reciever gets bent down as the rear action screw is torqued into place. On trued receivers with a snugly fitted bolt, it's common for the bolt to bind after the rear action screw is tightened. The solution is to bed the reciever so that the bedding is supporting the reciever as the action screw is tightened. Even without an indicator, you can wrap your hand around the forend and over the barrel and feel the barrel moving when you loosen and tighten the rear action screw. This is the result of the receiver being distorted. It's upwards of 1/8" of barrel deflection on some chassis.
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. Last edited by ar15barrels; 04-24-2019 at 1:52 PM.. |
#14
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the big problem bedding it is if you decide you dont like the chassis or want to up grade it will be hard sell...if you decide you love the chassis after shooting it for awhile then bed it. |
#15
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2s and 3s, as in 2-3 moa? With the cheap plastic stock, I’m sub moa already. I’d hate for that to increase.
__________________
Why is everything good???? Illegal, Immoral, fattening??? |
#22
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Well, chassis showed up today. Set the barell and action in it. If I snug the front screw first, as I snug the back, the fore the travels away from barell. If I snug back screw first, as I snug front, barell and forend travel together.
When I say snug, I’m talking only a couple pounds of snug. And when I say travel, I mean a lot. I didn’t break out the micrometer, but I’d say over 1/16, under 1/8. So for my own piece of mind, and to give myself every sporting chance at competing, I will be bedding this girl. |
#23
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Then as you tighten the front action screw, you are simply bending the action as the action comes down to the chassis. Don't do that! Always tighten the front screw first and the rear screw last.
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#24
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Quote:
__________________
Why is everything good???? Illegal, Immoral, fattening??? |
#25
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No just a better made chassis...I’m not saying they are perfect but I will say that my barrel does not move around when torquing the action and if it does you’d need a mic like Randal is talking about to see it.
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#26
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I’m gonna check mine out at some point. Thanks for posting that video. For now though I’m gonna keep shooting until I get better. My chassis is not an MDT but at some point I plan to start getting it more dialed. I’m happy now though that I’m on clay pigeons at 561yds. Once I’m more confident in my ability I’m hoping to be able to notice the changes like proper bedding and scope mounting.
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#27
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Here my issue with this way of thinking. How do you know you’ve gotten better if the gun has possible issues? If you shoot for months and you don’t see improvement, do you blame you or the gun? By having equipment that you know is mechanically right, you can focus completely on you. Lots of guys think that their rifle is more accurate than they are, but out that guy on a well built rifle and you’ll see that they’d shoot just fine. |
#28
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#29
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That is true. The problem is sifting through 95% of the weeds....
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#31
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did you tell them about the movement? and they still said its ok?
if yes id tell them i want a new chassis or my money back...if they do not step up and take care of you then id bed it i guess. but that much movement is unacceptable and they should fix or replace it IMHO. |
#33
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yeah its not...i can see a tiny bit but not like you are saying...tell them its flexing you action so bad the bolt is dragging and you want a new chassis or money back.
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#34
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The manufacturer or your own empirical evidence? A proper bedding job NEVER hurts the accuracy/precision. Lack of proper bedding usually hurts accuracy/precision. And when they say you don't NEED to bed, they mean it will work without it, not that it will work it's BEST without bedding. Shoot a few test groups before you bed and keep them for reference. Then bed it and shoot a few more groups under as similar test conditions as possible. Report back what you find.
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#35
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__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#37
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At this point I’m not going to take the time to assemble it, then take it apart to bed it. I’m just going to bed it and be done. It may very well work fine without, but I’m not taking the risk. The manufacturer says no bedding, and I expect they won’t ever say anything but that, even if they know it’s better. I’ll report back when all done.
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#38
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An aluminum chassis can bend a steel action that much?
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#39
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yes!
re-read Randells post #6...and next time your looking at chassis's look at how thick they are in the receiver/mag well area compared to the receiver itself. |
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