I do not own any 38 revolvers, but have several 357's. I have never used 38 brass, all my loads are made up in 357 cases. I have found that if I add about 0.5gr to any given 38 load, it will match that velocity in 357 cases. I have never had a problem with a light charge of Bullseye or W-231 detonating. It seems to me that the stories of light loads exploding are probably the result of double charged cases. It is very easy to double charge with fast burning powders, whereas the slow burning powders nearly fill the case with a single charge.
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