.45 super in USP compact trial.
I posted this in an HK forum, but I'll post it here for record purposes.
After a lot of searching, I couldn't find anyone who'd actually done it. Today I shot Underwood 230 grain xtp .45 super in my one year old completely stock usp .45 compact. I only shot one magazine, but I have to say I expected much worse recoil. It wasn't even as bad as my glock 29 10 mm with underwood loads. I wouldn't shoot it on a regular basis, but now I feel comfortable carrying it in the woods loaded with the super. The accuracy wasn't bad either. This post is really just for the collective information files in case anyone is interested.
Shootin' stuff since 1965!