Been useing the same gun for 3 years. Awesome sucess with a 250grain shockwave and 100 grains (2 pellets) of pyrodex. 777 primer. Tried a few different load ammounts. 150 grains of pyrodex i can hold a 3 inch group. 100 grains a can shoot quarters at 100 yards. Every gun is different even though they are the same if that makes any sense. Good luck with the new p/h!!