7mm RCM for F class

[cdparker]

It's winter here above the 60Th parallel so the mind has time to wonder. With the trend in F class going to 7mm; has anyone necked the .300RCM to 7mm? Considering the variations of the short magnums, I wonder if this case may have a very versatile powder capacity? I know that folks are playing around with the 7mm SAUM, 7mmWSM and the .300WSM necked down. Plus the standard .284 and some versions of that.
My thought would be to take the .300RCM case and run it into a full length bushing sizing die with a bushing to accommodate a 7mm bullet. Run an expander in the neck and outside neck turn to 0.012-0.013" Use a bushing type seater die--Not real difficult--Right?? Make a couple of dummy rounds and send them off to Mr. Kiff. Use a standard .300RCM go gage.
Then again, is this just a futile exercise, or would it have some merit?
Craig

 

[Cowboy Tom]

Sounds like a grand idea to me. I've been mulling over a nearly identical caliber to the one you described. My only fear is that these factory calibers will flop and cases will be tough to get. We'll see.

CT

 

[RDavies]

I have also been thinking about the same thing, something not quite as big as an RSAUM, but bigger than a Shehane or 280ai to get 180 bulllets up to 2950 without high pressures.

 

[cdparker]

Well, my isolation from the rest of world rears it's ugly head once again. I mentioned this idea to Mr. Kiff and he sends me two drawings. Drawing #32203- dated 11/12/10 is 7mm338RCM and #30193 is 7mm300RCM, dated 8/30/10. So-I bet that there is at least one person out there who has "been there-done that". I just happen to have an extra Barnard action in the safe and an 8.5 twist barrel on order. It's snowing a lot here, so I have some time on my hands. This might just be an interesting project. I think that the 300RCM should be the easiest to start with. What do y'all think?
Craig