I use H110 in my .357 Magnum loads and it requires a magnum primer. I almost bought some 2400 on Saturday, but decided to stay with what I had been using. Had I known 2400 was good without magnum primers, I would have gotten some.

I once could only find magnum primers and loaded a batch of .38 Spl with them for use in a Model 10. Worked just fun with the standard load of Bullseye powder I had been using