5% more case capacity...? All that I can add that may help you to sort this out is when both those cartridges are compared to a 300RUM. The RUM has 18% more case capacity than the 300 Win Mag and 13% more than the 300 Weatherby. The possible difference in terminal effects of the 2........probably not so much.

From there, I wish you luck......grin.

Last edited by magnumb; 11/16/09.