I know where a Kimber 8400 in 300 WSM is sitting for a good deal. I have a 300 WSM in a Win M70 EW so don't need another. I've always been intrigued by the RCM cartridges. Case head is very similar but the RCM case has a slightly smaller shoulder diameter (0.538 vs 0.515). On the surface it would seem to work. Anyone ever re-barrel a Kimber, or any other WSM based action, to the 338/300 RCM? If so, how did it feed the RCM case?
A 7-7.5 lb 33 caliber rifle would be sweet for chasing elks.
Thanks.
Why not just do the plain old 338/300 WSM since it probably works as is and you could neck up 300-325 stuff pretty easily? Not knocking your plan but the WSM brass is pretty danged easy to get ahold of.
^This. If the Kimber 8400 WSM mag is long enough this route is a no- brainer.
The 338 RCM was designed around the 2.8” Short magazine, and it’s case is shorter than the 300 RCM.
I believe ( but haven’t verified) that the Ruger, Kimber, and M70 short actions are actually a tad longer than 2.8” .
Are you thinking of necking up PRC brass for this cat ?
You could probably try cycling a few rounds of 300RCM or 6.5PRC through the Kimber to see how/if it feeds before committing to one chamber or another.
At one point I considered extending the chamber of a 338RCM to the 338/375 length & slapping it onto a long-action .Didn’t really make sense, even to this loon, as the SS barrel that I had was only 20” . Probably a tad blasty at that length.
Woefully, I don’t have it now, mostly because of ammo availability issues.
