Old thread, but I will add. My boat paddle Ruger has never liked 150's, till I stuffed it with Magpro and a magnum primer. 58-60 grains in a WW case, Sierra BT, and a 215M or WLRM took it from 2 1/2" groups to sub MOA. Accurate list 59-61 as max depending on bullet, I stay one or two shy with the mag primers.
