I use it in pistol brass, and at times it develops cracks very quickly, a lot of my factory loaded remingtons split on their first fire, whereas some older winchester super x nickle is still going strong.
Recently I switched all of my 357 brass over to nickle. I used to run 38 special brass all the time, just changed the ball between the 38s and the mags, and I also marked the boxes. But since my girlfriend got into shooting, I decided it was time to load 38 in 38, and 357 in 357 brass, that way there is no confusion for her, and safety is upheld. I bought the nickle to make it easy on me to tell the 357s from the 38s when I am pulling them out of the tumbler.