Several years ago I wanted to try a 7mm caliber in a short action and I decided to see if I could get a 284 Win to work. I built a rifle with a McGowen 284 Win barrel and a Savage Target Repeater action. I have been using 162 A-Max bullets set to max magazine length (2.95"-2.97") but the rounds don't feed reliably (at all) in my 8 round DBMs and I would also like to try some 180 grain bullets (Hornady ELD-M Match) which will require a much longer COAL.

In an ideal world, there would be a Savage long action that would work with my existing 284 win McGowen barrel (threaded for Savage (large) target action from LRP). No chance of that, right?

Assuming I need to find a donor rifle for a long action with DBM, which action/rifles should I be looking for? I think I would prefer an action with top bolt release since most after-market stocks/chassis seem assume top bolt release.

Thanks.