Don't get carried away by the Popeye Complex, that if a little is good, more must be better. But these "rules" have been in existence for 150 years or more. With modern steel and components, some folks feel the need to always push the envelope. You can use a coarser powder in the smaller bore but not finer powder in a large bore. The best hunting load is usually around 1.5 times the bore size, ie 67.5 grains for a 45 cal and 75 grains for a 50 cal, etc. For starting loads use the same grains of black powder as the bore size, ie 45 caliber, 45 grains, and a max should be twice that, ie 90 grains. slow twist is for round balls, for guns under 50 cal use fffg, for guns over that use ffg. For nearly every long rifle there are some old tried and true traditional rules of thumb.
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