I sure agree about the H4350 being close to Hornady's loads. I get the same FPS with the H 4350 in my 6.5 PRC and in my 6.5 Creedmoor with the 147 and the 143 gr. Thanks for finding your load here alsoI don’t mix different powders but as some of you have figured out even same powders of different lots may differ. I had 14# of H1000, simply poured all in to a five gallon bucket, snapped on the lid and rolled it around for a while. (During slightly humid day, out side on concrete drive way, away from the house). Worked well, several different lots, over a two year purchase. Now 14# of one homogeneous lot.
Also used H4350 under the 147gr ELD M and almost matched Hornady’s perfectly to their match Ammo out to 500 yards.