Colonel

I measured the slugs you sent me, and they indicate the bore is right about .428" tapering about .001" toward the muzzle.

The fired cases are .434-.435" inside the neck, so the chamber has good neck clearance to release the bullets.

This is really good news. There is a very good range of both jacketed and cast bullets to suit this cartridge. In fact, I called Stephen to tell him I have got to get a rifle with this cartridge, it looks neat. It should be a great one for deer up to 150 yards in the woods. That's about as far as I can see sights any more.