Birdhunter,

Firstly, welcome to NE,; you will love this forum.

Actually, a number for DR enthusiast will own a small/medium bore double rifle along with there stopper class. Many of our European fellow only hunt with light weight double rifles.

If you are building a homemade double, then a wildcat cartridge is not so odd because the rifle will never have intrinsic value.

You eluded to pressure, so I'll assume you know the issues.

With that said, let's build a wildcat DR rimmed case. The 9.3x74 is a good dooner case. I like the .358 so how about a 9.3x350?

However, my only worry is pressure. From the several men who have converted shotguns; the rule of thumb is 10 tons. You might have go think on the lines of .458 caliber, say 350 round nose.

B.