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Not so great if you live in bear or big cat country!
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Seems that almost all of us do not live in Brown bear country; that is what you meant(not black bears) wasn't it? And as for "big" cats, they seem to be easily shot out of trees with 30-30's or any little "efficient" cartridge.
To me an "efficient" cartridge is one that has a case volume that does not leave as much, little, or no empty space in most loads. Therefore, I consider the .308 more efficient than the 30-06, the 7MM-08 more efficient than the 7x57, the .260 Rem. more efficient than the 6.5 Swed. Given that they are mostly used as deer rifles, not as often for bigger stuff, the lightest hunting/game (not varmint), bullet is the common choice. Which such considerations, the extra length of the classics, requiring longer actions, combined with the (usually), empty air space in most loadings, make them less efficient. Just my opinion...just how I see it.