Thanks driftrider for the reply. Heres what I know about the muzzleloader. I bought it used from someone who let me hunt with him last year "which was my first year hunting."

Both of these are stamped onto the side of the chamber;

MML INC. Model T-5

"Black Powder Only" 50 Caliber
Made in Italy

The person who I bought this from has been using the pyrodex rs with hornady high velocity sabots with xtp bullets "according to the box" and the weight is 385 grains for the bullet weight. Hope this helps.