RE: .260/7mm-08
One of my brothers has used a Model 7 in 7mm-08 since the 80s, one of my buddies bought a .260 the first year they came out...In the 7mm-08 he uses 140gr CoreLokts and has killed at least 75 deer with this gun...
My buddy started with 140grs in his .260, they wouldn't group, went to 125 Partitions, they quit making them, went to another 120 load (I think ballistic tips) they quit making them as well...He had a heck of a time finding factory loading so he went to handloading, spent about $500 on his reloading stuff...He finally bought a .243 a couple of years ago as he just didn't have the time or patience to reload...
If a fellow doesn't reload, get the 7mm-08...You might even want to look at a .270 as well...