1. Those lower limits in the Speer manual actually are there for a reason. Not necessarily because of squibbing or suchlike, but because knocking the load down a half-grain results in a hell of a lot of unburned powder.
2. Unburned AA7 + Brian Enos' Far Superior Slide Glide (tm) = Lapping Compound.
3. The full NP3 + Roguard treatment is only $285.