Well, my practice load is a 148 wadcutter over 2.7 grains Bullseye. I haven't tried it on a hog. I ain't really shooting the hogs and timing how long they last, I just shoot 'em in the shoulder, watch their reaction, and check out the wound channel which has shown good expansion and complete penetration on 150-200 lb hogs. I really don't think taking some heat off it would matter except that expansion might suffer. I'm already in the lower range of velocity for what Speer says the bullets work best at.
5 grains of Unique under a 158 SWC is another utility handload I shoot. I should try that one just for grins.