I beleive the case capacity listed by Rifle Shooter magazine is going to turn out to be a bit low .
Otherwise , these new cartridges are not going to come anywhere near their published speeds , special powders and loading techniques not withstanding . Particularly out of a 20 inch barrel .
The RCM case will be fatter than a 350 Rem. mag , so it just about has to hold more powder than that case........
