I usually warm up shooting bulk 22, having followed the advice to “buy ‘em cheap and stack ‘em deep” after the last “panic.” Then I like to shoot reloads in various handloaded iterations of 32 in one or more of my 32 revolvers. Then maybe some 38s, mostly through my venerable K38 or my Baby Chiefs Special. I occasionally break out my AR 15 or 9mm Franken-Smith and fire a small amount of factory ammo (which I can reload but currently don’t) to keep my hand in with those two guns.
Obviously then, I do most of my shooting with abundant rim fire and well stocked reloads, and save the factory stuff until more seriously needed or until once again more readily available.
Apropos of nothing, when I saw the title to this thread I thought maybe the OP was asking about my shooting sequence, ie how do I warm up during a session at the range? The answer to that is contained above... I start small and work up to large. On the rare occasions my 44 or one of my 45s get shot on the range, they are toward the end of the session... if a flinch starts to develop, I want it near the end of the session, but I find if I “start small” I’ll be less likely to suffer “flinch-itis” when I get to the big boy guns. YMMV
Froggie