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I don't know the answers to your questions, but everything I've read says the M-1 is very specific in timing for proper operation, and messing with it, with faster/slower powders, heavier/lighter slugs, will cause problems, from non-ejection to slamming the op rod to smithereens.
With the specific set up you have for your long range rifle-I'd leave it be, pay the piper, and do what you have to do to shoot it the way it was designed/set up.
With the specific set up you have for your long range rifle-I'd leave it be, pay the piper, and do what you have to do to shoot it the way it was designed/set up.
