I had a good load worked up for my 300 Weatherby. It's on the hot side, pushing 208gr at 3100fps with light extractor marks using Weatherby brass. Decided to try out some Hornady brass as it is easier to find and a little cheaper. Loaded them up, took them out and blew the primers out on 4 out of 5. Packed up and went home. Variables: Weatherby brass being resized by just bumping the shoulder back .002. Hornady set from factory.(let a friend barrow my head-space gauge so i don't know the difference between the two) Neck tension. Somebody didn't run the brass through the resizing die before loading it.(I am kicking myself for this, I Know better) Zero temperature 80F, 26.6C. Shooting today 100F, 37.7C Any Ideas on what to do next? Should I buck up and stick with Weatherby brass? Drop a half a grain, expand the brass and try again? Or rework my load for less pressure?