Hello; I've been tinkering with a gascheck forming tool that seems to work fair-to-middlin' well,the punch out a slug and "push it thru a die" kind. The cal is 8mm as that was what I was playing with at the time.The slug was cut from an aluminum food can .010 thick,as just a trial, worked well,the check clings tight to bullet after going through a.325 lube-sizer die, can't remove it without a tool. The food can supply of metal was very soon exhausted,found some aluminum flashing that was the required thickness, it also formed acceptable checks.
Sounds good,so far,thought I'd try to switch from aluminum to copper,I had no soft copper stock, so I split some copper tubing annealing and hammering til I got my required stock, this'' ain't no option'', however it did make a few nice checks. I started a search for copper stock of the right sort, got a real eye-opener; as best I can figure it would probably cost me money just to make copper checks over buying ready made!!!Soooo- aluminum appears to be the only option for cheap gas-checks.
After all this blather-I'll get to what"I'd shore lak to know", is the abrasiveness of aluminum gaschecks sufficent to exclude them from use in valued firearms????I think I've seen aluminum jacketed pistol bullets [Blazer],but have not seen or heard of commercialy produced checks. I'm as usual, trying to do 'stuff' that requires help from people who are more knowledgeable than myself and to whom I'm always grateful for replies and advice. Thanks lreed