No wonder the 260 is so slow comparedto the 6.5 x 47; the barrel is 8 1/4" shorter. If you consider 20 fps/inch of barrel, you would have around and extra 160 fps to add to the 260 velocities. I am using 120's out of a 28" barrel and I am getting 2880 fps out fo the 260 without pushing them very hard.
Who says they're "comparing" anything? It is just two sets of load data that naturally follow each other, with barrel lengths and pressures clearly shown.



























