I started this a few years ago. the laws changed in Canada so I cant finish it. the new law prohibits anything above 10k joules or 20mm bore. this is 22mm (.866") bore. so this is from an old thread on a different forum.

its a 7 bore, (22.0mm) so it will shoot 1000gr lead balls and also ill use shot in it. its a 36" long chunk of 1 1/2" 4140, its been drilled and reemed. the barrel is straight for 6" then starts a taper that takes off .150" per side at the tip. the barrel now weighs 9.4 pounds with the breech plug, thats made of the same material as the barrel, those threads are M27x1.5

i'm kind of just building it as i go, i don't really have any plans or anything, just starting a part (the barrel) and making the rest of the rifle around it.