I've got 5 6.5X55mm rifles (two Husquarna M-36 military, 2 Husqvarna M-36's converted by Kimber to sporting rifles and, 1 Danish M-52 target rifle with Lyman 48 sights [converted German M-98 with 28" Schultz and Larsen barrel and Lyman 48 sights). All are accurate and one of the M-36's is equipped with Elite aperture sights and is very accurate (1.5" groups) while the M-52 can do 1" if I do my part (with 75 year old eyes)! I wonder what younger eyes could do?

I also have a Remington Model Seven in 260 Remington (1-9" twist) that is not too accurate. I'm going to have it re-barreled with 1-8" rifling.

The 6.5 bore seems to be an ideal bore size for many applications.