I have a Tikka T3 Varmint in 260 that sits in a KRG X Ray Chassis. I use it for Steel plate shoots and long range goats. My load is a 130 grain Norma Diamond Line over 45gns of 2209. Accuracy sits around .6 for 5 shots. Velocity is 2890 FPS. 2209 is a very suitable powder. Try altering your seating depth, this has a s much if not more of an impact on accuracy as a powder change. Also look at 130 grain bullets I think that 130 is the right weight for a 260. BTW I run an AI mag so I can seat my bullet out quite a bit more.
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