I have the Bushnell 2-6 on my 15" .308 and will be putting the same scope on my 14" .223 when money allows. I really like the fixed eye relief, even though it comes at the expense of some field of view. From a solid rest at 100 yards, I have no trouble shooting right at an inch with the Bushnell on 4, 5, or 6 power. I wouldn't complain if it would go up to 8X, but that's not overly important for my use. If you plan on shooting varmints at extreme ranges, I would opt for something like Burris 3-12X and just skip all the mid-range scopes.
FWIW, I got the scope and barrel (.308) used and have no complaints. The only problem I've seen with these scopes used is that folks want nearly as much as a new one.
Good luck!