I have a 358 JDJ but haven't spent too much time working with it since I have so many other projects, but I have developed two loads so far. The first uses a Hornady 200 grain RN seated to the cannelure, 51.5 grains of AA2520, and a CCI BR2 primer. This load runs 1975 fps from my 14 inch SSK barrel that has an Arrestor brake built in, so actual length of barrel is about 12 1/2 inches. The second load uses a Hornady 200 grain spire point seated .035 inch off of the lands, 55.0 grains AA2520, and a CCI BR2 primer. This load is running 2200 fps. I haven't taken any game with these loads yet, but did expansion test them and found them to perform well.