dbblung I wish I could tell you the answer to the magic bullet theory but there is none. A lot of it will depend on what your rifle likes. You've already learned that Powerbelts in 245 grains did not please you. Perhaps had you lowered the powder charge down to 80 grains of loose Pyrodex RS it might have made a world of difference. But it appears you're a pellet shooter so lets address this question from that standpoint for now.

100 grains of pellets and the right projectile will take most any game in North America. Many of the professional muzzle loading rifle writers like Jim Shockley and others have proved that. The trick is the right bullet and the right shot placement. Now Shockley used to use a Nosler Partition and he had excellent results with them from deer to the great bear and moose.

Personally out of your rifle and with 100 grains I would TRY some..

Nosler Partition, Barnes Expanders, Hornady XTP, Speer Gold Dot, Parker Extreme Ballistic, if you want conicals, Sabertooth conicals, Bullshop Conicals, just to name a few. Get a few of them. Try them with 100 grains of pellets or move to loose powder. See which one of them gives you the kind of accuracy you demand. Then place them in the right spot and let the bullet do the rest.

There are a lot of bullets out there, I have only touched on a few. I mean no disrespect to those I did not mention. I am only saying the ones I shoot and have had good luck with. For instance in my CVA Staghorn Magnum I shoot a 300 grain .430 dia XTP with amazing accuracy. I shoot 90 grains of loose Pyrodex RS. But thenthat rifle is deadly with a 245 grain Powerbelt as well..

So all you can do it try some of the bullets mentioned. See which ones shoot best for you. Then place that shot. Good luck and happy hunting.