Sisco;
Welcome to black powder shooting. I have an Investarm .54 Cal and really like it. I suggest you get two books...both by Sam Fadala.
The first is "The Complete Blackpowder Handbook" 4th Edition I believe is the latest. Everything you need to know about black powder is in this book.
The second (and probably the best) is "Black Powder Handbook & Loading Manual" 2nd Edition. Here you will find all kinds of load data. This is the most complete listing of load data combs I have seen in one place. This book lists 51 different load combinations (projectile & powder) with 9 different charge volume (40gr to 120gr in 10gr increments) data lines for the .54 cal rifle. This gives you a starting (and safety) point, but you need to see what works best for you.
I personally shoot a 90 grain (Goex FFg) powder load and a 230gr .535 round ball with a .015 lubed patch. My rifle seems to group best with this combination.
Sakima
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