You are right Mr. Chris that is a glib answer
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Volumns could and should be written on flinch, yet the subject never seems to come up nearly enough. It seems to be the "macho" thing to say " Oh me I'm not flinch sensitive" and those words usually come from the guy shooting the 300 wm or the .458 elephant slayer. Most shooters do have a flinch of some sort, unless they use a regular type of flinch control. No matter what they say.
I am a big man, and never considered flinch much at all. Me I'm just to damn tough to flinch I would say. That ended one day for me at a ATA trap shoot. I was watching a buddy shoot his round of handicap. This guy was one of the top shooters in the country in that discipline. He was clean through his first three relays or 75 shots. On his last set he was on shot 17 or 18 ( still clean) when he had a bad primer or just a dud, when that 12 ga didn't go bang I thought he was going to drop the shotgun he flinched so bad.
At this time I was only dappling in ATA Trap, and shot mostly BPCRS or Black Powder Cartridge Rifle Silhouette. I shot a 45-90 and a 610 grain custom bullet designed around the old Postell bullet. This sport is shot mostly prone, off of cross sticks and no rear support other than your hand. I shot a lot of practice and thought I would add some form of flinch awareness to my practice shooting.
I found out a lot not only about flinching but follow thru and just hard hard it is to kill a primer. I did in fact finally kill some primers were they would not go bang. Shells were loaded in the regular way with some cases ( usually 5 or 6 per 100) getting the dead primers. I also found out you must fool yourself about which shell is live and those that are not. if I knew that the next shell was a dud I would automatically correct the flinch, if I was completely unaware which was which I got a different result. When you drop the hammer on one of those duds, (IF) you have a flinch you will sure know it right then and there.
It is a simple thing to correct a flinch when using this technique. Once you become aware that it is there stopping it is really no big thing, it is that awareness that can be illusive. In time I bought 10 thousand blank primer cups from Winchester and that solved the killing primer thing for awhile, today I have used all of those cups and am back to killing the damn things. And that is not easy not at all. The results from this are well worth the effort at least for me they are.
Roland