I have to side with Lloyd on this one. I have yet to develop a flinch, at least with my guns, but when I moved west to Wyoming in 1985, my sister had been there since 1975, and had a terrible flinch with both her handgun and her rifle. I started her in a program of very light loads in the very guns that she flinched with. In her Dan Wesson 357mag revolver, not only did I use light charges of Bullseye, but also the lightest bullets I could find. In no time, i.e. a couple weekends, she was shooting 38spl +P loads and after a month or so, she could put a cylinder of real 357's where they needed to go. Still, I kept her in very light target loads for her 'everyday' shooting. That flinch has not returned. In her 30-06 Remington 700, I took her 180's away and gave her 110gr hollowpoints over 40gr of IMR4320. A month later, I worked her into 130gr hollowpoints over 46gr of IMR4064. Another month and she was shooting the same bullets over 53gr of IMR4064. Eight months later, she shot a mule deer with a 150gr Nosler over 48gr of IMR4350, followed by an Elk with a 170gr Herters over 52gr of IMR4350.
The drift of all of this was using the same weapons and turning the expectation of pain back into an expectation of fun by using very light loads behind very light bullets.
As a sidebar, her 'heavy handloads' that created the flinching were created by a hunting companion who actually thought the 'pain' would keep her home. It just created the flinch and a dislike for shooting, though she loved the hunting and would not stay home. I was happy to be able to help her and then watch the results in the field - the surprise and excitement of actually keeping her eyes open as she squeezed the trigger and noting the animal taken in a very sporting fashion. She really is a better shot than she thought she was, and better than a lot of guys I've hunted with. No Flinch. The program works.
I shoot a LOT of light loads in my hunting rifles. My heavy loads go without notice. Or Flinch.
Regards,
Sweetwater