Yep... the 405s would be the only lead Powerbelt I would mess with - due to increased fragmentation with the smaller grain sizes. You shouldn't experience leading because that grain size works best with a reduced powder charge. My guess would be between 70-80 grains 777.

I think both Chris and I know knows the fella with the most success using the 405s. I'll bet it's poster Deer Assassin over on the Tennessee Board.