One thing I forgot to mention. Shooting a revolver without a round in each cylinder gives the recoil an uneven push back against the frame, and will eventually screw up your gun, stretching it, and making the frame bend.
This of course, varies with the power of the round, and, the quality of the gun, but, it will, and does happen.
Empty rounds still provide the head spacing, and an even distribution of force against your frame.
As for the flinch, I find if I've had too much coffee, or I'm nervous, certain days my hands aren't as steady as they used to be. On those days, I either go home, or I try and shoot through it. I concentrate on getting a good site picture, pulling the trigger, and following through AT the target, and, try and be able to see the same site picture, after the trigger is pulled.
Two martial arts tricks I've used shooting:
One is visual a successful shot, as a moving picture in your mind, not thinking about the details. In other words, see a movie of you doing everything you are supposed to do, prior to actually doing it.
Second: RELAX!! Hold the gun like a birds egg, pull slowly, and try and catch the gun as it recoils. Start with light loads. I know this goes completely against what everyone teaches. Other famous gun guys take a death grip on the gun, and pull, and hold on. I don't. I pull the trigger, and let the gun recoil up. I'm good enough at this that I can pull it down for a second shot very quickly.
I developed the second technique shooting LOTS of 200 grain hollow points, out of a Detonics Combatmaster VI, with smooth wood grips. The loads were in the .451 Detonics mag range, read around 35-40K pressure, and, I couldn't hold on to the gun, hard, without it busting my wrists, real good. So I learned to take advantage of the fantastic trigger, pull lightly, and follow through, catching it on the way up. I've used this technique on .454's, with
360 grain bullets, at 1550 fps. Needless to say, at some levels, you can end up with a hammer in the forehead, so be careful.
Third: Shoot at 7 yards, and be happy. Somedays you aren't going to have, it, somedays you are. Heck, I've got a controlled flinch, but, I work my 22's in, and they tend to make me see what I'm doing with the flinch, so I can correct it. My usual bad shot is low left, pulling the trigger down, and left, not straight back, gun going straight forward...
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