Hodgdon HP38 and Win.231,same powder?

[jeff43]

I've read these powders are the same, is this true?According to the burn rate chart there is a little difference.I bought some HP38 to use in 38 special with 158 grain lead bullets.I'm loading on using a little dandy powder thrower on a RCBS Green Machine.I have a #5 rotor in it which will throw 4 grains of HP 38.I've only found 1 book that has a load over 4 grains for HP38,and saw a few that has 231 loads over 4 grains.Anybody use HP 38 in 38 spl.? Edited March 1, 2014 by jeff43

[Garufa]

If you look on Hogden's website, who makes both powders, the loads for both powders are identical for all bullets weights....

 

http://www.hodgdonreloading.com/data/pistol

 

They are the same.

Edited March 1, 2014 by Garufa

[jeff43]

I've been reading they are the same,but didn't know why the burn rates are different.
Thanks Jeff

[Guest Lester Weevils]

Ramshot zip is sposed to be "near identical" as well.

Wonder if a caution would be to make sure to use weight vs volume? IOW, maybe it would be risky to just dump new W231 into a powder measure that had been previously properly adjusted for HP38 or ZIP and expect the thrown weight to remain the same?