Ok, thanks! I did leave out a bit of info. W231 powder, lead semi wadcutter bullets 158 gr. I guess my question was: why so much less powder for the .38. I would have guessed that I would need more because of the extra cartridge length. I do have a RCBS loader with the Nosler book. What are your recommendations for grains for the .38? should I just go by the book or is there a magic number you folks wouldnt mind sharing.