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1stmar, how old's your firing pin spring?
I've noticed that when they weaken down to about 80% or their original rating, muzzle velocity spreads increase.
In my Win. 70's, their factory springs' are rated at 23 pounds; I replace 'em with 26 pound ones. Even that much of an increase over a new spring gives much better SD and ES numbers.
In my many years of competitive shooting, a couple friends have asked me if I had a spare 'cause they were getting big elevation spreads at long range. One of them used the new one I loaned him and won the next match. The other did shoot better scores.
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