When testing for accuracy, sandbags are your friend. A sandbag or two under the forearm, and a sandbag folded up between your shoulder and the butt, with another sandbag under the buttstock.
This isn't as good as a "lead sled" but can be pretty close in terms of letting the rifle recoil consistently without killing your shoulder trying a free recoil method.
If you find a load that groups tight from the sandbags, and things open up when you shoot from a field position, odds are it is you being inconsistent breaking the shot. Have a friend load your magazine with a dummy round at random, if you are flinching it will show up very quickly.
Another thing to do is practice 3 to 5 perfect dry fires between actual fires.
Jimro
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Machine guns are awesome until you have to carry one.
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