So- Curl, I have a couple of questions. I have a 318 dia double, bullets are not easy nor cheap, so thinking of patching these. .308 up to .318 or .320 should be fairly easy, and thinking of jacketed as starters. I read to roll them on a file for adhesion, and have tried this with success. Can I use the powder charges I am using with copper? Is there an issue with the bullet in the unfired chamber of a double, in this caliber, backing out due to having to be so careful with seating- a lack of neck tension?

I understand Ross Seyfried did an article on this very subject a while back, with success, but can't locate either the article or Ross.

Any insight would be appreciated.

Thanks, Doug