Been there, done that, got the ulcer to prove it (figuratively speaking of course). When such a thing happens, certain firearms notwithstanding, I generally look to ammunition issues first. Case in point: I have a great Pedersoli Remington Rolling Block in .45-70. I sighted it in carefully, made out a range card, the whole deal. Come the day of the Cowboy Long-Range match, all three of my warm-up/sighter shots were dead-center at 480 yards. Once I began shooting for the record, however, things went straight to H*LL in a handbasket. Needless to say, I didn't even place. Long story short, the ammo was the culprit.
And sometimes the rifle is the culprit. Consider, if you will, the Mini-14. The earliest versions (Series 180 and 181) were reasonably consistent, but nothing to write home about. The later the version, it seems, the worse the accuracy/consistency. The term "minute-of-barn-door accuracy" comes to mind...
-- Nighteyes
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