I've not tried them as I tend to shy away from buck-a-bullet models. I know center fire shooters have nothing but good things to say about them though.

My bullet philosophy with regard to muzzle loaders is this. Just about all of my shots will be under 100 yards, and at most as far as 150 yards on very rare occasions. Basically, I tend to mimic 45-70 loads - a heavy bullet at somewhere between 1600 and 1800 fps. Two tried and true bullets, the 300 grain Gold Dot and 300 grain XTP, will do the job for me. I play around with other bullets for fun, but when it comes to hunting I'll be using one of those twoor a fat round ball in either .54 or .58 caliber.