The 30&357 Herrets were originally developed using H4227 and the recommended loads were hot! 25/4227/110 and 24/4227/125BT.I have found the Hornady V=max 110's to expand well at Herret speeds. My 14" 30H likes WW680, too bad it went away! I have killed animals deer and hg up to 250#'s and the Herrets worked quite well. In current time I only use G2 frames for the Herrets. There has never been , that I know of, a comment about how much more pressure the G2 will take over the original frames. If any one knows I would love to hear it.
Varmint load, I use 110 V Max and have had good performance.