received the French 8 bore pinfire rifle today. Nice and big. Weight is close to 11 pounds. Groove diameter of .873, chamber cast base in front of the rim is .937 same all the way to the end, no taper. Length is 3.65". I haven't slugged the bore yet. I have to find a hunk of lead large enough. Sights = 25 meter standing and 50, 100, and 150 folding