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Jim Watson · January 26, 2007, 09:16 AM

HP38 comes off the same production line in St Marks, Florida as Win 231.

BUT, I have seen both powders in the same manual with slightly different top loads and velocities.
And I GET slightly different velocities from the same charge of HP38 and Win231. HP38 runs a little faster than Win 231 in .38, 9mm, and .45.

Now that might be lot-to-lot variation, or maybe Hodgdon specified powder to be sold as HP38 a little different from what Winchester sells as Win 231.
Or maybe the first batch Hodgdon got was a little faster than what Winchester was selling, and for their next and present orders they have said "Send me more like THAT." A combination of lot variations and company specs.

Moral of the story: Use brand-specific load data and refine with a chronograph if available.

January 26, 2007, 09:16 AM	#2
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 18,543	HP38 comes off the same production line in St Marks, Florida as Win 231. BUT, I have seen both powders in the same manual with slightly different top loads and velocities. And I GET slightly different velocities from the same charge of HP38 and Win231. HP38 runs a little faster than Win 231 in .38, 9mm, and .45. Now that might be lot-to-lot variation, or maybe Hodgdon specified powder to be sold as HP38 a little different from what Winchester sells as Win 231. Or maybe the first batch Hodgdon got was a little faster than what Winchester was selling, and for their next and present orders they have said "Send me more like THAT." A combination of lot variations and company specs. Moral of the story: Use brand-specific load data and refine with a chronograph if available.