Hornady Black temp sensitive

[KenC]

Hi All. I went out yesterday in the afternoon in SE Louisiana and it was 93 out(damn hot and humid). Wanted to run through some Hornady Black, for the brass, and had 50 rnds of resized Starline brass to fire form using cheap 100gr bullets(picked up 500 pulled bullets). First cold bore shot with the Black was 2921fps. It settled down to 2875. They seem to running quite hot, so I surmise the powder is quite heat sensitive. The primers Hornady uses were all flattened. On some of the Hornady brass, the belt line is visible. Basically, I ordered what I could just for the brass. I am thinking about pulling all I have left and reducing the charge(do an OCW) or replacing it with LVR. All of the 50 resized Starline case looked great. They all measure 1.190" at the Datum. Every last one of them. At least I have my chamber now for them. The Hornady came in at 1.190" for only one case with a few at 1.191" and the rest at mostly 1.192" and one at 1.193". Go figure. Time to clean, inspect, anneal and run them thru the dies. Any of y'all seeing high fps with the black? Oh, the barrel is a 24" McGowen.