Retumbo....one of my Tikka T3 LS 270WSM rifles likes 69.0 or 69.5gr the other prefers a Compressed Load of 71.0gr. Federal 215 primers. I get great groupings.
Had other powders to try but was happy with Retumbo (H1000/7828SSC/WS780/MagPro). A hunting buddy bought a T3 in the camo model 270WSM a couple years ago..we went to the range with my 69.0gr reloads to sight in his rifle....and it shot identical to mine...under 0.5" groups at 100m.
