That's missing the point. The point is that it's not uncommon for revolvers to be tuned by their users to fire only a specific brand of ammo or primer.
Hell, I wouldn't know if my guns will crack S&B primers because I've never put S&B in my carry guns. And why would I, when Federal is plentiful and relatively affordable?
Well, I have watched Jerry's video, "Trigger Job." In it, he says that duty guns should be set up to fire any ammunition that can safely be loaded in the chambers, because someone who carries for a paycheck can't necessarily know in advance what ammo will be available when they need some. (But he sets up his competition guns for Federal primers.)
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Not another dime.
Why? A carry gun isn't a duty gun, and you can afford to be selective about ammo. I haven't modified the action on my LCR at all, but I still wouldn't know if it will crack Winchester primers, because a Winchester primer will never see the inside of that gun.
Being smart with purchases helps - I can afford to stockpile whatever ammo I like for my carry gun and not worry about it cracking primers on some random ammo. Plus, .38 and .357 is pretty shortage resistant, so even if I somehow managed to shoot through however many thousand rounds of American Eagle I have, I can get more.