Swifty
I have experienced problems like you discuss in real hot weather. In fact I had a 257 that the loading was 1 full grain different from summer to fall with only a difference in temperatures of about 15 degrees.
The main thing I wanted to point out was the accuracy with 8208, which I find more important that velocity. I twist knobs when varmint hunting, so velocity is not my main priority.
I would agree that Benchmark is truly one of the best I have found for my 20 TAC and 40 VMax. The problem is that Sportsman's Warehouse nor any other local shops can get it. I do not want to deplete my supply to load for the 223.
I always approach loads over recommended with caustion. That is what bullet pullers are for .
