Well, I was assuming (and I know what they say about assumptions) a powder charge in the 30/378 equal to that of the standard .378 wby mag.

You do make (of course) valid points about gun weight, etc.


Actually, after I went back and cross-checked some reloading data, the 378 Wby mag and the 300 Rem Ultra are at least similar in powder charges (90-110 gr in the ultra mag) and the 30-378 sits in the 120 range. That's not 378, that's the necked down version, but the original 378's have a very simlar powder charge as the necked down 30's do.

.300 Ultra Mag brass is huge, but even it's puny when compared to that .378 Wby stuff.

There's just a bunch of difference, when it comes to recoil anyway, between the "old" magnums such as the 7mm Rem Mag, 300 and 338 Winchester Mags and the new and/or huge stuff such as the ultra mag line from remington and necked down 378 wby mags to fire 30 cal bullets.