Tonight I shot it for the first time. I had 38 rounds left of my 148 grain HBWC handloads that I fired first. POA was 6:00 on the bull.
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I also put a couple cylinders-full of 178 grain Keiths on top of 5.3 grains of Unique, which is a +P load. It shot those accurately as well but recoil was quite a bit more than the wadcutters, as you'd expect. It would make a good field load, however. (The New Service and Shooting Master are perfectly fine with +P or .38/44 High Speed Loads.)
I'm looking forward to trying it at longer range.