I put one of these on layaway about six weeks ago. I recently got it paid for and put on a Redfield 3-9x40 scope. Last weekend I got it basically dialed in with some 100 grain Hornady interlocks, using necked-down 7mm-08 brass in Winchester form.
Yesterday I tried a couple of 120 grain loads in hope of using the .260 for black bear, spring season here in Wyoming. I tried the 120 BT and 120 TSX, using H4350 I loaded up 42.0 and 44.0 grains for each bullet.
Using previously fired, FL sized brass, the 42.0 and 44.0 loads of 120 BT grouped poorly at about 2.5" at 100 yards for 2.5 MOA. My 120 TSX with 42 grains H4350 then grouped at 3 MOA, so I was pretty disappointed.
Finally, I had 3 rounds of 120 TSX, 44.0 H4350, that I made with unfired brass, just necked down from 7-08. The group went into 1.330". All of the brass was trimmed, chamfered, deburred. I used WLR lighters and loaded the BT's to 2.775" and the TSX to 2.760".
This 1.330" group was good enough for now so I loaded up 6 more rounds of the 120 TSX. How do I get this kind of accuracy with previously fired brass?
ETA: I think the unfired brass vs. fired/FL sized made the difference here. The loads were otherwise treated the same way, basic case prep, same COAL for all TSX and the slightly longer COAL for the BT.
Last edited by LightsOutSix; 05/28/12.