Trophy hunter .260 with siarra 107 gr not grouping

[foxx]

Hi, all.

I am having trouble finding a load for my .260 Trophy Hunter with Sierra 107 gr BTHP.

I pillar-bedded the factory stock, then started working-up some loads. The only bullets I can find in .260 are the Sierra 107's, so that is what I am using. Lapua brass and Federal Match primers.

So far I have tried Varget, H4831 and Benchmark. Best I can do is .952 inch 4 shot group with Benchmark, seated just off the lands. The rest are nowhere near that. I have also tried playing with seating depth, but no real luck.

I will try H4350 next, then IMR BLC (2), but I am running out of powder options (what I have on hand), bullets and money.

I am using the Nikon 3x9 scope that it came with, maybe that's my problem. I don't know.

My question is this: Has anyone out there had luck with 107's or is that maybe the problem?

Also, so you know a little about my experience and ability: I get 3/4 inch groups from my Marlin 45-70 Guide Gun, 1/2 inch groups from my Browning A-bolt in 30-06 (sporter barrel), 1/2 inch from Tikka .270 WSM (sporter barrel), 1/3 inch from Savage 25-06 (sporter barrel) and 1/3 inch from Savage .223 (varment barrel). I want 1/2 inch or better outta this .260.

Any advice or shared experiences with the .260 is appreciated.