RE: Barrel length- .257 Roberts and 7mm-08
DEar Charley Brown,
I hunt some pretty dense stuff and prefer the shorter length barrels[22"] for this kind of hunting. Last thing I want is for the barrel to slam into a tree as I take a shot at an Elk. When I was hunting in Hawaii out on the lava flats I used my 264 Win whose barrel is 23" but still gets 3100 fps. For most stuff now I use my 25 Souper and its barrel is 22". Either cartridge you mention will do nicely with a 22" tube. Personal choice only. Good luck with your new rifle.
Aloha, Mark[in Or]