gotta disagree with Swifty on H335. would never use this powder in a 22-250 as it is the most temp sensitive powder I've ever used and a bit too fast of a burn rate also.
This is my experience as well. A couple years ago a friend came out to Montana to shoot PDs with me. His only rifle was a .22-250, and the loads had been worked up in the Tacoma, Washington area, where they caused not problems.
We started shooting on a typical late-June day, which got up to around 85 degrees in the afternoon. Once the barrel on his rifle got warmed up, we had to use a cleaning rod to help get at least 1/3 of the fired cases out of the chamber. Have seen this a number of times over the years with H335, and not just in the .22-250.
