They arent sloppy, they just need to fit....as you know too well.

The 1917s universally eat a 454 bullet the best, as pretty much all wheelguns in ACP and 45 Colt had throats 454 to 456. 454 or 455 bullets, dont seem to make much difference.
Hardness should be above 10 but anything up to 28 shines.

The Anaconda (and 25-5/25-2s) need simply to be fed pre war bullet sizes utilizing older dies or cowboy action dies of appropriate sizes and hard enough to hold the shallow rifling and seated straight or be long enough to stay straight through the cylinder.

Cant stress enough of how many "failures" can be pointed at the expander, the sizing die or both.

The defunct 45 Anaconda can easily be given a Smith like DA pull and shoot with any 41 or 44 Magnum which is saying a lot...The King Cobra and MkV actions can do the same.

The Keith bullets (namely the RCBS270 SAA) shoots okay, but with wheelweight metal it is too small just like most NEIs Ive toyed with. Both are/ were cut for type.

Fed the fat 455 260-340 LBTs and sized point foreward, they have shot like crazy for me.