FWIW, I've found 4.8 gr of Bullseye to work well with the 158 gr bullets in 357 cases. I seat Xtreme plated to 1.57 OAL. It may be a little hotter than a regular 38 load but nowhere near a full bore 357 in my guns. I'm not really happy yet with my 148 DEWC loads but my last try was 3.5 gr of Bullseye with a DEWC seated to 1.37" OAL.

I only recently started using Bullseye again so I may be full of dung.