Originally Posted by
bigbulls
RUM... no belt and non radius shoulders.
But my honest opinion is cases the size of the RUM need a .338" diameter bullet or larger and cases as large as the 378 WBY need a .358" diameter bullet or larger. Anything smaller is way too much powder being squeezed into too small a hole and things like throat erosion become excessive.
I also agree with the post above for the most part. Unless you are not going to shoot it often barrel life will be short.
I am not sure what your intent is with this rifle but if you want a rifle that drops animals on the spot at close or medium ranges or you want to have an extreme long range rig, the 338 cal will out perform the 30s with these larger cases.
Some of the new 338 cal Ballistic Coefficients are really impressive and those large cases can push them at impressive velocities.
If you are married to the 30 cal I would choose the 300 RUM in a 28" barrel and push something link the 200 grain accubond. 3200 fps is attainable and the .588 bc is hard to beat.