This thread has seemed to be about capacity, using water. I have some old Barnes 6.5mm 165g original bullets. They are 1.3680" long. Seat them in your 260 Remington COL 2.800" then seat them in a 6.5X55 with a COL of 3.150. Get both to fit the magazine and the throat/lands of the rifle. Which one do you thing will have more useable capacity in the case for powder? The 260 is a great round, is the 6.5X55 better? Only if you want to shoot really heavy long bullets. Does one need to do this? Don't know, we could build long action 260's with a long throat, or 6.5X55 on a few selected short actions. It's a rifle looney thing.
