I use the 125gr. JHP (# R-102A) which is .357" in the 38's. I use the 115 JHP (# R-125A) which is .355" in the 9mm. I don't think the 125gr. shoots any better at 25yards than the Precision Delta 148 HBWC that I have been using forever - not sure at 50 as I was just starting to work on loads, etc. when bad weather set in. Also, I do not have a Ransom rest to use for ultimate accuracy. Big plus with the jacketed bullets is the cleaner gun. Still working................ Will post more later.