Kind of odd that in that 1993 manual, that one Clays loading that the OP used is the only Clays loading listed on the entire page for anything.
Right above it is a Universal loading. That has only one other load listed on the entire page (upper right group).
Clays hit the market in early 1992. This load data if it is not a typo or other data entry mistake of somekind, is probably their very first for the (shotgun) powder in a handgun caliber.
The load listed is a Max load IIRC how the manual works.
Starting loads were supposed to be reduced by 10% or something like that.
Even then it would be over the top by the most recent data by my failed math.
I shoot some Clays in handgun, but keep it and most all my loads at the starting point or near it.
The primary use is 12ga shotgun and had been for nearly 25yrs till just recently when I switched to Alliant ClayDot for 12ga. The 'new' Canadian mfg Clays which I was finally able get a jug of is too light and fluffy for lack of a better word. It bridges in the drop tube of the MEC and was immedietly giving me troubles with powder drop. One light,,the next near double,,ect in the Mec. Sometimes bridging in the tube and not dropping til the progressive would rotate and jar the powder loose in the tube, spilling it all over as the hulls moved on to their next station.
A fine mess you've gotten us into Ollie..
I'll use it in handgun loads w/a scoop measure I guess. I don't trust it now in a powder measure.
ClayDot uses the same load data recipe as H/Clays in 12ga. It's a bit denser so the charge weights are a little heavier for the same bushing but that is accounted for in the data.
I've no intention of trying ClayDot in a handgun load. Plenty of other load data powders in stock for that w/o trying to guess what would be anappropriate load.
As long as those lab tested powders don't have typos in their published data we're all OK!