Free: Contests & Raffles.
You're over thinking it. A 250gr+ anything has plenty of pop at 150 yards. Never shot the Barnes, but shot 30 or so critters with a muzzy with probably close to a dozen projectiles. What powder charge?
with muzzy bigger weights are better. When we were a all lead state, I shot 440-460gr bullets. With todays newer bullets I still try to stay around 300 gr. I shoot the 290gr barnes.