barnbwt
member
- Joined
- Aug 14, 2011
- Messages
- 7,340
"Blowback vs. Gas operation means much tighter tolerances for safety reasons"
Not super sure what that's supposed to mean, but the blowback guns mean the necks set back a good, frightening .06" or so. The brass is really thick, so it doesn't seem to be an issue from the reading I've done on the subject, but it would definitely freak me out, some.
Like I said before, the small case head + big primer cup means there is very little brass to keep the pocket from opening up after only a couple reloads, leading to loose primers that must be staked (lame). That is something I'd call a true failing of the cartridge itself; the setback and polymer coating are more an issue inherent to the blow-back operation (show me a blow-back 9mm operating at 50ksi that won't need chamber flutes or a Teflon coating )
I personally think what the round really needs, is some good platforms with a true locking breech. That way we can really see what the casing can do, and can reload it the same way we'd do a 22 Hornet or other 'little bitty magnum' . We'd need a donor Coonan or something like that to try this out, though (good luck with that ). At least as far as rifles, I'm working on a design using a falling block action housed in an MP7 Airsoft shell, but methinks that won't be ready for some time
TCB
Not super sure what that's supposed to mean, but the blowback guns mean the necks set back a good, frightening .06" or so. The brass is really thick, so it doesn't seem to be an issue from the reading I've done on the subject, but it would definitely freak me out, some.
Like I said before, the small case head + big primer cup means there is very little brass to keep the pocket from opening up after only a couple reloads, leading to loose primers that must be staked (lame). That is something I'd call a true failing of the cartridge itself; the setback and polymer coating are more an issue inherent to the blow-back operation (show me a blow-back 9mm operating at 50ksi that won't need chamber flutes or a Teflon coating )
I personally think what the round really needs, is some good platforms with a true locking breech. That way we can really see what the casing can do, and can reload it the same way we'd do a 22 Hornet or other 'little bitty magnum' . We'd need a donor Coonan or something like that to try this out, though (good luck with that ). At least as far as rifles, I'm working on a design using a falling block action housed in an MP7 Airsoft shell, but methinks that won't be ready for some time
TCB