A friend of mine here killed a large bull with the then new Ruger 77 in 7.62X39, and claimed a .300 Winchester would have done no better. IIRC, the range was within 100 yards. A million moose have been killed with .30-30s, and although I consider the .30-30 the superior game cartridge, the ballistic similarities are close enough to draw comparisons, particularly with some of the anemic factory loads we've seen since the demise of CIL.