I accidentally proved to myself what everyone else already knows: H335 is temp sensitive. I was out in the desert chronographing some loads and I decided to run my H335 load again. Not sure why I even did it because I already know that the 50 grain Nosler SP runs at a very consistent 2970 FPS. To my surprise, five shots averaged 3040 FPS. I know its the same powder lot, but then I realized that the rounds had been sitting in direct sun for about a half hour. It was a cold morning, about 45 degrees but I think the sun was the difference. I also noticed that my groups weren't as tight as the last time. Before this trip I didn't see any reason to use anything but H335 in .223. If I decided to change to something less sensitive, but wanted to stay with a spherical powder, what would be best? To answer my own question, I'm thinking TAC. I have a ton of the 50 grain Noslers so that will be the main bullet I load for a while. What do you all suggest?