Originally Posted by Travclem
.260 is a ballistically superior round in every aspect to the .308. The 142gr. 6.5mm matchking has a better sectional density and ballistic coefficient than the .308 175gr and 190gr. Matchkings. At distance, the .260 blows the .308 out of the water. It shoots flatter and has less wind drift.
According to this article by Zak Smith, a 140gr .260 carries 87% of the energy of a 190gr .300win mag at 1000yds.
IMO the only reason .308 is popular is due to its military use. 6mm, 6.5mm, and 7mm are all ballistically superior to the 7.62mm.
I've been curious about 6.5 Lapua for some time now. I wonder if an AR-10 pattern rifle could be made to work in it....