Judson,

What you said, and I quote, is "I used 118 grains of IMR 4831 with a 500 grain bullet as a blue pill. 118 grains of this powder is the A Square max load for a 465 grain slug".

That very clearly says that Art Alphin's book lists 118 grains of IMR-4831 as a max load. That is not the case. He lists 118.6 grains as the max load with H-4831, which, as we all know, is a completely different powder. My great concern is that someone will see your post and try that load as a regular load in a hand-held rifle, with possibly disastrous results.