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It turns out am the first to do it. There are 35/30 RCMs but no necked up 338s.

Azshooter - been thinking about that one myself. Liked the 2.015" case length for long bullets. Got a request out on a forum up here in Canada for a few spent 300RCM and 338RCM cases to neck up to 35 and compare case capacity. Too few RCM guns up here yet I guess.

But maybe you could advise me as to the grs. of water to the case mouth of your 35/338RCM as compared to 35/300RCM flavour - if you mocked one up for comparison?

Also interested in your donor gun for your project?

I built a 350WSM a few years ago and feel the need to go down that wildcat road again for some reason. Dave Kiff also supplied my reamer too for that project - which turned out to be a great rifle BTW.

Thanks - and sorry for the sideways hijack.

http://35cal.com