favorite loads of mine from a few 260s Ive had ~
700 mountain rifle 22" tube
120 grain Nosler BT over 49.5 grains H4831sc - .6" 5 shot groups if I let the barrel cool between shots
140 grain Nosler Partition over 46.0 grains H4831sc - 2625 fps and deadly on deer, shot under 1" easy for 3 shots
700 titanium 22" tube
140 grain Hornady Interlock over 45.0 grains RL19 - 1" groups and 2685 fps avg speed.
700 custom gaillard 23" tube
95 grain Hornady Vmax, 43.8 grains Varget - half inch groups @ 3315 fps
107 grain Sierra Matchking, 41.8 grains Varget - 3/4" 6 shot group @ 100m, 3120 fps
125 grain Nosler Partition, 48.0 grains H4831sc - 2890 fps and groups around 3/4"
129 grain Hornady Interlock, 43.5 grains H4350 - 2815 fps and groups around 3/4"
47.0 grains of H4831sc does 2820 fps and shoots a bit under an inch
130 grain Nosler Accubond, 46.5 grains H4831sc - 2785 fps and groups a bit under 3/4"
130 grain Barnes TSX, 43.0 grains H4350 - 2875 fps and groups under 3/4"
140 grain Hornady Amax, 46.7 grains H4831sc - 2750 fps and groups half moa
142 grain Sierra Matchking, 46.2 grains H4831sc - 2740 fps and groups half moa
155 grain Lapua Mega, 40 grains H4350 - 2560 fps and 3/4" group
I also load for a friends 260
Sako 75 SS
129 gr Hornady Interlock, 44.5 grains H4350 - 2795 fps and groups around MOA