Have got HE 2 bore cases set up....Steel, 5 inches long,
1.225 bore. To make cases I only need lathe work.Found supply of barrels, using 30 mm barrel sections
of the same bore. In picture is case with 3500 gr bullet,
and a muzzle barrel section from a 30mm cannon, 39 inches
long.These are 250 bucks;breech sections are heavier and cost 295 bucks I think. Muzzle section has intregal flange
you see in pic, that can be use to anchor pivot pin and
lug block to barrel(silver solder) to make a break action.The block would butt up to flange so that solder
wouldn't have to hold forward barrel thrust.And remove rest of flange
not needed on sides and top of barrel..
Barrels are rifled, with deep rifling and fast twist. Me,
I would ream out to smoothbore and use cast, nose heavy foster type slugs.(reamers easy to find). The twist is fast enough to stabilize 4500 gr slugs if needed, and you want to use rifled. Muzzle section is heavy enough for
25k loads, with these super strong cases. Steel cases will last forever, probably not
needing resizing if using 10-15k loads.25k loads will give 35-40,000 ft lb loads,
if you want, in a 30 lb gun.12k loads would give 15,000 fp.
If you use the thicker muzzle section and build in a falling block,
or mount into a huge action, you could get 80,000 ft lbs,
over twice the ME.I can make cases and found big boxer
primers, that don't need adapters. This as smoothbore,
could also shoot 20 54 cal balls for a super buckshot load.
On my 4 bore progress I will have press and dies in a little
while to make 4 bore brass.And tooling is getting set
up, so 4 bore barrels should be ready to be made in a few weeks.Ed