Been shooting my 375 Whelen last couple of days, this load seems to show to be very promising! After reading that AA 4000 was the 375 Whelen powder I looked at the burn rate chart and saw H380 was just one above it. Loaded 49.2 grains over a 288 gr. GC boolit, got 3 touching and 1 above after 2 clicks up on the scope. Might need a click or 2 right @ a 100 yards!