So i took my RPR out comparing H4350 and IMR 4451 using my Chrono. Here are the results:
H4350 all using CCI #200 Primers, once fired Hornady brass and Nosler 107 gr CC BTHP.
Temp was 92 deg with 85% humidity
H4350
41.5 gr .981" chrono didn't work right.
41.8. .846" 2916 fps
42.0. .595"...