I own a deerstalker along with 3 other lymans, and all left handed by the way. two flint and two percussion.
I like the Hornady PA conicals and buffalo ballets the best, they are around 240 gr i think and shoot real well and great on deer. plus they are reasonably priced.
Use real black, dont bother with the other powders, save that for your inlines. flints just wont set them off reliably. a lot of people use 2f as the main charge and 4f in the pan. i like to simplify things and use 3f for both, dont see any difference in lock time.
the less powder you use in the pan the quicker the big bang. practice practice.
my deerstalker likes 65 gr of 3f with a 240 gr conical, killed many a deer. i dont hunt bear so someone else will be able to help you with that.