This load is above SAAMI spec; it would be considered a Level II load (under 22kPSI). It is safe in a Blackhawk or a N-Frame S&W.
8.0 Grains of Unique pushing a 429421 cast of COWWs+2% Sn lubed with Carnuba Blue sized .431 (revolver throats measure .432).
No lead fouling...only a dusting of carbon fouling. I am using "new" Alliant Unique.
Absolutely stunning accuracy. I sat back against a tree and shot with my hands between my legs as depicted by Ted Keith in Sixguns. Put a cylinder full through the bull of a NRA 50-yard smallbore target at 50 paces, the group measuring about 2-3". This is the first time I've ever tried this position and it is a winner.
The load has already proven itself...it's basically the Skeeter load with a half grain more Unique (with improve the accuracy slightly for me). It chronos 1075 +/- 10 FPS from my 6.5" 624. It is not abusive in terms of recoil, but it is not a target load either. This is a real working load that I would think would be plenty for deer or anything smaller.