Back when I shot IDPA sanctioned matches and really believed that I'd be held accountable over the chrono (silly me) I loaded 5.0 grs. of 231 with the 158 gr. SWC and plated bullets to get to 130 PF in my Model 66. I remember the plated bullet loads had a distinctive muzzle blast and the fouling on the frame and cylinder was a nice brown color but I never noticed any high pressure signs. Also, 231 burns nice and clean the hotter you load it.

Dave Sinko