Here is picture 2 bore barrel with a mockup pivot block on
underside butting up against the integral flange on
the barrel.I ground off the flange on the top and sides.
The section of flange left on bottom should be grooved and amatching
protrusion on block set back into it. With block soldered on, set in flange, it would handle any strain
that lock system holding against barrel thrust would deliver. I cut one lump, block could easily have more. Or it could have an interupted
screw thread up from bottom of action, operated by swivel lever/trigger guard.

The 4 bore barrels we are getting set up have enough diameter to leave a similiar flange, also.In picture is
2 bore case, 4 bore case and 458Win for comparison..Ed.

It was built by Ken Owen. Last I heard it was for sale. I'll try calling him this week (I think he's on vacation). I'll get his exact load and post it. I remember from discussing the development of these guns that the shotgun primer was a cruicial step in making it work right.

I forgot I have a single bullet on the shelf. These are measurements from that bullet taken with a caliper.

OAL 4.531
Case 3.981
Rim thickness .130
Rim dia 1.204
Base dia 1.095
Mouth dia 1.044
Bullet is at least .995, I don't have a pulled bullet and I can't tell if it is full diameter in front of the case.

I'll sent more info when I get it from me amego.

Weight 8.6 oz +or- .1 per cartridge...begs for a 40 round bandelero!