I carry my 638 with the white box 125gr +P. Haven't had any issues with the couple thousand rounds I've put through of them. Accurate, reliable, and inexpensive enough to where I can practice with them plenty at the range. Those Airweights do take some getting used to. It took me a couple hundred rounds to get comfortable enough with it it to carry. I also pulled the trigger a couple hundred times with some snap caps as well. Getting used to the small grip and heavy trigger thoroughly helped me.