All that^^^^
I've been loading for the .45-70 for about 20 years, and I'm fixing to start loading for a Pedersoli 1885, now, too. Every rifle is different, for sure, and I would tailor each cartridge for that rifle alone. NSB is correct... cannelure and crimp is not necessary on a single-shot rifle.
IMR4198 is a good .45-70 powder to start with. When I first started loading the big .45, I used slower powders... big mistake. The slowest powder I use now is IMR3031, and normally it's IMR4198, AA5744, or the like.
Don't discount cast bullets, either.
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"I have this pistol pointed at your heart!"
"That is my least vulnerable spot."
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