I have my new GAP 260 with a 24" barrel arriving in about 3 weeks. Some have told me I need a 5.5-22 to get "out there" meaning 1000+ yards. I can get to 1000 now with my 3.5 (on a 308) but haven't really stretched it past that. I think the 260 will go to 1400 yards but don't know how much I'd be shooting that distance. So, if it were you, is the 3.5-15 enough glass?