Shoot as many as possible, to see what fits you and what you like. All companies making good ones now. Make sure you remember caliber restrictions, so 50 cal is probably most useful for you. Twist for full caliber conical a is important so something between 1:22" to 1:32" is best. For loose powder I prefer Pyrodex P, use what gives you the best shooting groups. Some like 777, some like Pyrodex RS or Select. You can't use Blackhorn because doesn't light reliably with percussion caps. Bullets are power belts, Great Plains, no excuses, buffalo bullets, TC Maxiballs, roll your own paper patched and sized. So many choices and so much fun burning powder until you figure it out. You can even stick with traditional and round balls if you like authenticity. Build yourself a beautiful period rifle