Oldbloke wrote:boingk wrote:bladeracer wrote:Never anneal the lower part of the case.
Try chamber your hulls before you load them to confirm they chamber okay, otherwise you'll want to resize the bases.
Yup. For anyone following along and thinking 'why?' the case head and lower portion of the case shouldn't be annealed as you will be likely to have extraction problems or even case head / web integrity failure... otherwise known as a facefull of hot gas or even a 'bang' at the wrong end of the gun.
No expert here. But just re thinking this. Most centerfires are usually 40,000 to 55,000psi.
But 410 runs at 12,500psi.
Soooo, logic says
perhaps it's OK to anneal further down the case than usual. Just a thought bubble. More research me thinks.
Perhaps, but I can't see any reason you would want to. The .303 brass doesn't have to be expanded out to the full .410 size at the case head.
I don't have any plastic hulls, only Magtech brass .410 shells. .303 on top. The .303 measures .453" across the case head, the .410 measures .470", but I wouldn't expect the .410 hull to expand the head under the low pressures it operates at. The .45 Colt I use in a .410 chamber is expanded to .475" under fairly stout loads. If you don't need the column height, .45 Colt is another option for .410 brass but half the length. CCI makes .45 Colt 150gn shotshells. Frankly, I would just shoot .45 Colt in the .410 with bullets rather than shot