Leading and poor sustained accuracy usually go hand in hand.
It's pretty difficult to have leading in a fixed chamber in such a low pressure cartridge; fit and losing land engagement being the primary suspects.
Once fit and finish is knocked out of the park, you don't even need but a sliver of lube (not the hard wax) at regular 45 auto pressures. Gas checks are certainly overkill unless the barrel is cobby; at that point, soft or hard doesn't matter.
I run tested 25 BHN stuff in most contraptions and have nary an issue. Another plus is that the hard stuff feeds like like jacketed and correctly designed ones feed as slick as hardball.
