Well, I guess if we think about it,, we're talking Grandkids here, so by the time they're all around all of us old fart collectors will have all the good military (since we're talking battle rifles) M1s and all models of boltguns hoarded up. Since the youth these days are flocking to the range to learn this stuff (note of sarcasm there), they probably won't even know what an M1 or 1903 are. Thier limitations will be what they see, so that is going to be limited to the AR's, if we're really lucky the M14 will continue it's welcomed comeback. So there you have it,,, 10-15 years from now they will only probably be aware of M16s and M4s and maybe m14s. I see that people have mentioned .270s , .30-30s etc. I don't know of any battle rifles chambered in those, and of course the other day I ran across a heated arguement about ARs being in battle rifle class or assault rifle class,,,, so that leaves it to the m14. Chances are pretty good that thier choice of favorite battle rifle,,, hasn't been put into service yet, unless it's an evolution of the M14.