Successful M14 Experiment !!

chopper 1

chopper 1

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:DFor all you dedicated group shrinkers - I have cut shims and put them under the heel of the receiver instead of putting them over the trigger guard rear at the bottom of the stock. I kept putting thicker shims under the receiver heel until - magic ! -Remington UMC which shot worse(8-10") than S/A (3-5") now groups 10 rds into 1 inch at a hundred ! The good stuff (match) still shoots the same - no change. S/A still the same. Same results on 2 different rifles-(1 aluminum bedded ,1 G.I fiberglass.)
Barrel Harmonics and stacking tension are obviously at work here.
Bottom line - try it - u may be pleasantly surprised.
I used steel with a tin crush shim on top to kinda bed the shims to each other. Its important to find the magic thickness fer yer rifle -
Me very happy ! Gonna try it on my epoxy bedded M14's also - will let u all know-:D
 
Wow, that's some great group. My best to date 5 shot group at 100 yards with just under 1.5" at 100 yards, using Federal 150 grain ammo. I can get less than that (1.5moa) in moa at 200 yards using Federal premium vital shock, but that was limited tests of 3 shot groups. Too expensive for punching paper, but good stuff on deer.
 
Grizzlypeg said:
What if anything has this done to the barrel tension? How about the way the receiver sits on the stock along the sides?
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Barrel tension and whip as well as how the receiver sits in the stock is affected but obviously in a positive way . Your mileage may vary. I didnt notice a change in the look of the receiver on the stock at the sides. I started with 5 thou and worked my way up until the magic happened. The stock ferrule band pressure appears to be the same - didnt notice a change there. I think that the shims just bedded the rifle action to the stock more tightly until the optimum tightness was achieved. By the way the rifles were standard tune ups -(op rod guide tightened , shimmed etc.)
I think its a matter of the tuning fork principle. Each rifle will be different depending on its harmonics. I suspect it will also work in glass bedded norcs as well but with much thinner shims so as not to pull the receiver away from the bedding, but just enough to cause tension.
Sorry no pics until "she who must be obeyed" gets back from Ireland with the camera.
 
I nibbled a receiver shim out of a piece of industrial pallet strap. Be careful to allow clearance inside the receiver for the hammer to swing. It worked in a Garand. Haven't had to try with an M14. The other squeeze point for a Garand is under the long edges of the trigger group. A couple pieces of aluminum rain gutter folded once or twice and hammered tight worked there too.
 
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