What do you wan't to hunt with it? If hunting deer with the PRB 100yds will be your maximum shot with the Roundball. Your rifle can also handle a number of good conicals. If you buy pre-lubed conicals you do not need a patch and they are easy to load. I would try the 425gr Hornady Great Plains Conical. You do not needa patch with those. The have a hollow point for maximum expansionon deer.

Here is a good place tobuy from. Scroll down and below the roundballs are the Great Plains Conicals. http://www.possibleshop.com/ball-bullet.htm