Dan, I have shot only golf balls and zinc balls in my 1/3 scale bronze model 1838 Coehorns and have never measured how far they shoot. The powder chamber is made to scale and is 1.0 inch in diameter at the top, .625 diameter at the bottom and 1.410 deep. It will hold a max of 130 grains of 2F powder in a foil cartridge but I usually use much less, 30-60 grains.