Most accurate so far.

LRP in .260
140gr Sierra Match King
2.754" OAL
Nosler Brass
Wolf NCLR primers
37gr H4350
2450fps

Things started to open up after 37.5gr and never came back togeather.
Max for this combination is around 40gr H4350.
Running a ladder I went up to 43gr where I had a primer fall out. Ooops...

I have some 140gr Hornady Custom Comps and 140gr AMax on hand to try.
But it's still early days. Haven't had this rifle for very long.