I've been working a bit with a new LH Mark V Ultralight in .270 Wby (26" barrel). Here's a few results:

140 gr Accubond/ RL 22 / 70 grains / 3260fps avg.

150 gr Ballistic Tip / RL 22 / 69-70 grains / 3220fps avg.

150 gr Partition / RL 22 / 69.5 grains / 3240fps avg.

Weatherby cases, CCI 250 primers

All loads shoot 1-1/4" consistently; some groups go 1".