In the 1980 Lyman 3rd Edition Cast Bullet Handbook the +P load data for W231 was 5.2gr with bullet #358311. (as stated in the OP)
In the Lyman 4th Edition Cast Bullet Handbook which was published in 2010 with the same #358311 bullet and W231 is the same 5.2gr for a +P load.
I understand the reluctance of the OP to use that data with today's HP-38 but that 2010 data was published by Lyman well after it was verified both W231 and HP-38 are identical powders. I hope this puts the OP's mind at ease, according to Lyman you are safe using the higher charge weight with HP-38.
__________________
Freedom is never free!!
SWCA #3437
|