25-06 Rem, 120 gr. Nosler Partition @ 3100 fps
+/- 3" Point Blank Range of 301 yards (256 yard zero)
100 - 2865 fps, 2185 ft-lbs, +2.5"
200 - 2640 fps, 1855 ft-lbs, +2.3"
300 - 2425 fps, 1570 ft-lbs, -3.0"
400 - 2225 fps, 1320 ft-lbs, -14.2"
500 - 2030 fps, 1100 ft-lbs, -32.4"
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260 Rem, 125 gr. Nosler Partition @ 2950 fps
+/- 3" Point Blank Range of 291yards (247 yard zero)
100 - 2750 fps, 2100 ft-lbs, +2.6"
200 - 2560 fps, 1820 ft-lbs, +2.0"
300 - 2375 fps, 1570 ft-lbs, -3.8"
400 - 2205 fps, 1345 ft-lbs, -15.8"
500 - 2035 fps, 1150 ft-lbs, -35.0"
Less than 2" point of impact difference at 400 yards between the two, that's pretty damn close. 25-06 starts out hotter but due to the fact the 6.5mm bullets almost always have a higher ballistic coefficient, it makes up ground on the less aerodynamic 25 cal bullet and matches downrange velocity and energy quite well. 260 fits in a short action and burns 10-15 grains less powder too.
Don't get me wrong, I like the 25-06 too, but the mild 6.5's really shine 8)