RL15... IIRC 56.5 gr, RP cases & RP LR primers did very nicely accuracy-wise in my rifle though I haven't chrono'd it.
56.0 RL-15
RP hulls
CCIs
3.270
avg. 3085fps
1/2 MOA
22" Tikka
Basically a fat 270 with a little more energy and 5" more drift at 500 yards.
