Ever fire a 8MM Mauser round in a 30-06 rifle?

[RED]

Or how about a .308 in a '06? Or a 3" 12 ga. in a 2 3/4" chamber. I'd bet there are a lot of such happenings that guys won't talk about because it was an unintended/negligent (possibly disastrous) event.

I've done all of the above. The most egregious being the 8MM in a 1903 Springfield... 35 years ago, I was shooting hand loads that were neck sized with brass from a different rifle. The idea being to reload the brass for the "new" rifle. The bolt was a little hard to close on every round but one round in particular required more effort. Turned out it was a factory 8MM round that had been somehow mixed in with a cigar box full of '06 reloads... but the '03 handled it and was not damaged in any obvious way.

Come on guys fess up!!! I'd bet there are some untold laughable happenings along with some horror stories. Stories that (if told) might prevent future serious foul ups.