This. You're going to struggle to find 22cm brass in the UK so just neck down and fire form. Job jobbed.Wildcat have Gunwerks 6mmCM you can easily neck down
What fire forming is involved?This. You're going to struggle to find 22cm brass in the UK so just neck down and fire form. Job jobbed.
We supply Lapua 6mm CM neck sized down to .22 CM and AMP annealed for £175/100 posted
www.c2precision.co.uk
What fire forming is involved?
If forming from another cartridge like 22-250 you’re fireforming, if necking down 6 mm creedmoor the body amd shoulder are already formed.You shoot it.
When necking down from 6.5 to 22 the body and shoulder are indeed already formed, but the junction of the neck and shoulder will have - when looked at closely - a significant bulge. Fireforming fixes that (firing once). It might also be worth checking that a doughnut hasn't formed internally after firing and trimming that, too.If forming from another cartridge like 22-250 you’re fireforming, if necking down 6 mm creedmoor the body amd shoulder are already formed.
But we’re talking about 6mm to .22, not 6.5, so less brass is pushed down when forming the neck.When necking down from 6.5 to 22 the body and shoulder are indeed already formed, but the junction of the neck and shoulder will have - when looked at closely - a significant bulge. Fireforming fixes that (firing once). It might also be worth checking that a doughnut hasn't formed internally after firing and trimming that, too.
It will still have a bulge, just a smaller bulge. You're necking down, it'll not be perfect out of the die, but the chamber pressure will correct that when you shoot it. For everyday situations it won't matter a toss. But, if I were using necked down brass for, say, competition shooting I wouldn't use it until it had been shot once and checked inside the neck for doughnuts.But we’re talking about 6mm to .22, not 6.5, so less brass is pushed down when forming the neck.
Makes sense, usually when forming cases from and other cartridge I try to go up with the neck, rather than down, for the reasons you mention.It will still have a bulge, just a smaller bulge. You're necking down, it'll not be perfect out of the die, but the chamber pressure will correct that when you shoot it. For everyday situations it won't matter a toss. But, if I were using necked down brass for, say, competition shooting I wouldn't use it until it had been shot once and checked inside the neck for doughnuts.
I'm a pedant. The sort of person that will clean a rifle after twenty rounds. Apologies.