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My son and I were at the range recently trying out my new S&W 686 and 625. My son started with the 686 shooting 38's and his groupings at 10 yrds was excellent. After half a box each we swapped guns and his first shot with the 45 acp was dead on (literally, the center of the bull's eye). But then his grouping went to hell. Clearly (and he recognized this first) he was anticipating the recoil that was absent with the 38s and then flinching. It was a very interesting if accidental experiment.
I shoot a lot of big bores (41 Mag to 460 Mag) and I keep pretty good groups when I first shoot, but as I approach the end of a box (sooner with the 460 M) I notice my groups getting bigger and bigger. Fatigue, anticipation and flinching. Thus the practice time!
I understand that this phenomena is why the FBI, a few years after converting to 10mm in a modified 1911 platform (the S&W 1076), switched to the much lighter .40 S&W.
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