Home Forums Hunting & Shooting Custom Rifles & Wildcats 7mm RCM????

I had a spare 300 rcm under the bed that I considered trying a 6.5 rcm on but I just sent it to a new home in Texas. When I think of 7mm's I still dream of one on the full size 375 ruger case. You could seat long heavies out to 3.6 and still run em through the mag of a remmy. Think of a shorter beltless stw with more room to chase the lands.

I carried my 338 rcm this fall in eastern Idaho and it sure is easy to like in the brush. Mine wears a vx3 2.5-8 and shoots well. I'm currently running 225 g IB's at 2650 over rl15 out of a 20" tube.

Bb

Burleyboy - do you happen to know if the case taper and shoulder angle/position is identical on the 300RCM and 338RCM? I notice the 300RCM is longer over all (2.100) than the 338RCM (2.015". But is that just a longer neck without any other case dimension differences? In other words could the same headspace gauges be used for either flavour?

I can't tell from my pics and info. Also perhaps others may know this and could enlighten me with the facts on this.

They definately need different gauges. The shoulder on the 338 is back further and the case capacity is less by about 4 grains. They probably did it because of the long ogive on most 338 bullets. I did a dummy round where I necked up a 300 rcm to 375 and those bullets seated at the canlure still fit in a short action. I think the 300 is the one to wildcat unles you want more room to seat a bullet out the the 338 is better. 338 bullets just tend to have longer ogives leaving more bullet length out past the neck.

You could probably find diagrams at pacific tool and gauge.

Bb

Curious if Hornady mentioned anything about the 7mm RCM at Shot Show or if anyone has some news. Mostly just tracking the post to see if anyone has gotten a reamer or any new information.
K

I asked the reamer makers at SHOT about requests for a 6.5mm wildcat on the .300 RCM and got blank looks. One volunteered to check the file and get back, but no email yet.

jim

300 and 338 capacities are supposed to be 72 and 68 grains, respectively.

This got my attention. I think 7mm saum is too much power and 284 too long for SA so why not a 7mm RCM and make it 2.0 overall case length.

I think that at this point it would be too hard to locate cases to be worth it. Those other cartridges are excellent company though, you might use .300 saum brass necked down, that gives you a longer neck and reduced capacity closer to the 7mm rcm.

Only problem i have with saum and wsm is they rebated, gotta friend with a wsm and bolt run over sometimes. To bad the rcm died. Imagine a true short action case with 284 winchester performance. A long neck for long bullets and not so darn overbore and killing barrels.

huskyswede,

The RCMs are not dead.

The RCM brass is still available:

300 RCM
http://www.midwayusa.com/product/17...s-300-ruger-compact-magnum-rcm-box-of-50

338 RCM
https://www.grafs.com/retail/catalog/product/productId/7082

As for rifles Ruger still offers both chamberings in the guide gun.