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Old 05-09-2016, 03:10 AM
ArchAngelCD ArchAngelCD is offline
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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.
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