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“….what bullets (cast or jacketed) do you think are worth a look, what powders, and how would you load for this rifle if you were going for 200 yards on full scale silhouettes?”
What I had in mind for a long range bullet (target and hunting) for use in my 45 Colt Rossi M92 was the Accurate 45-250G. That is a RN bullet with a flat meplat taking a GC similar to the Lyman 454190. It should drop at .454 with COWW or slightly more with 2% tin added or with your “house” alloy. I’d let them AC and age for 2+ weeks and then size at .454, lube with BAC and use a Hornady GC. I would first try them over 4227 and then RL7.
Also I quit using a tugston carbide sizer on my 45 Colt cases because the 45 Colt is not really a “straight” case…..it is tapered. Since I like to inspect my cases before reloading anyway I clean them, lube them and then FL size with a RCBS standard steel die which maintains the taper crimp. I them clean the lube off (15 – 25 minutes in sawdust in a Thumbler) and either finish loading for utmost accuracy or top end loads on a single stage press with the RCBS dies. My generic fun loads I finish loading on a Dillon SDB sans the sizer.
That Accurate bullet cast and loaded as mentioned should stabilize as nicely as the 454190 does in the slow twist of the Rossi M92.