H4350 is about the same as mainstream pistol powders here, nonexistent!
I've been messing with Varget, R17 and H100V.
So far R17 has been the ticket.
41.5 R17 with hornandy 140 bthp gets me 2800 and very good SD/ES numbers and easy sub MOA 10 shot groups in a 26" barrel.
Varget obviously works well and H100V seems to show great promise.