Without reading the entire thread, what you are talking about is headspacing off the extractor. I've heard of one person using long bullets in a 10 seated long in a 40 case with success. How much is unknown.
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Without reading the entire thread, what you are talking about is headspacing off the extractor. I've heard of one person using long bullets in a 10 seated long in a 40 case with success. How much is unknown.
That covers it. Might work in a controlled feed gun, not in a push feed.
We have had attacks of the stupids and fed an H&K P7 with .380s. It sorta worked, but leaves a question of 'why?'.
There is also the issue of bolt weight and recoil spring power. For the OP, I'd make my carbine either .40S&W or 10, but not try to have both if you value reliability.
Moon