Learn me....7br brass down to 6mm

[Tireguy]

Long time listener, first time caller.

I just got my rifle rebarreled to 6BRX. I stumbled in to 300 new pieces of Norma 7BR brass at no charge. What do I need to do to size the brass down so that it will fit into my chamber in order to fire form it?

Will 7BR brass even work?

Jon

 

[treeman]

I would size it down in two steps and only far enough to chamber with a little resistance using the 7mm neck to form a 'false' shoulder. the false shoulder will hold the brass back against the bolt through the forming prosess. good luck. ps I'd do a few and try fireforming before you doing all the casses.
treeman

 

[Cheechako]

Talk to your gunsmith. He will know the type of chamber he cut. He can tell you if you'll have any problems in using a straight neck-down or whether you'll need to turn necks or use different brass.

if he says all should go well, then do what treeman said.

Ray