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I don't know, but I have used .38 spec.brass for all of my .38 and .357 revolvers. I shoot the 35156 and 358429 mostly and they have given me excellent accuracy. I also shoot hollow base WC with 2.8gr of bullseye but have never compared group sizes between .38s and .357s, I guess I should do that. Be sure to let us know how the longer brass works out.
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