If the OP really needs to ask this question, then I wonder if he really should be shooting at deer that are far enough away for it to matter which cartridge he is using.
I love the .45-70, and it would be my choice for hunting if I knew I wouldn't be shooting much beyond 250 yards or so. It won't destroy much meat at all (far less than a .300mag), it'll kill any deer or black bear that ever lived (not just the "average" critters that he'll probably shoot, but even the rare monster specimens that we dream about!), and for me it would just be way more fun to use. It will work much farther than those ranges, but it becomes much more difficult to hit with it at longer distances.
The .300 is obviously the answer if long range versatility is thrown into the mix; it's flatter trajectory will make it much easier to hit with.
And as much as I hate to be the guy that chooses "C: none of the above" when that wasn't one of the original options...I've got to comment that if you actually need to ask this odd question, you probably should be buying a .243 or .308 and learning its limitations and yours.
I love the .45-70, and it would be my choice for hunting if I knew I wouldn't be shooting much beyond 250 yards or so. It won't destroy much meat at all (far less than a .300mag), it'll kill any deer or black bear that ever lived (not just the "average" critters that he'll probably shoot, but even the rare monster specimens that we dream about!), and for me it would just be way more fun to use. It will work much farther than those ranges, but it becomes much more difficult to hit with it at longer distances.
The .300 is obviously the answer if long range versatility is thrown into the mix; it's flatter trajectory will make it much easier to hit with.
And as much as I hate to be the guy that chooses "C: none of the above" when that wasn't one of the original options...I've got to comment that if you actually need to ask this odd question, you probably should be buying a .243 or .308 and learning its limitations and yours.