So as if I haven't put enough time, gas and $$$ into developing loads, I decided to give the 250 TTSX a go in my .375H&H. One problem is the current Barnes manual has no loads for this round listed. So I did some linear interpoloation between the 235 and 270 grain versions of the TSX. I used RL15 listed loads to estimate the max for Varget since their burn rates are similar. I used H4895 listed loads for the same. My calculations put max load for Varget at 79gr and for the H4895 at 75gr. Well I didn't even get very close to that with what I loaded up. At 77gr of Varget, a little bit of a sticky bolt and just a light extractor mark. At 77.5gr the bolt required effort to open and a very clear extractor mark on the brass. At 73gr of H4895, no issues. At 73.5gr the bolt was again getting just a little sticky and a light extractor mark. After the results with Varget, I was inclined to quit there. That's the bad news. The good news is the rounds were producing very nice groups. I had a tripod problem and was not able to chrono these rounds. If the manual is in the least bit close for the 235/270 rounds, they should be flying easily above 2700fps and perhaps close to 2800fps. I'll be working on this load some more and when I have final numbers I'll post them. But in case anybody is getting started with this round, do be careful. I'm really questioning the Barnes manual. The max load listed for RL15 for the 270gr round is 77gr, so it surprises me that I'm getting high pressure symptoms at 77.5 with the 250gr round. One last note, I was loading these such that I was crimping just behind the leading edge of the front groove. I don't remember what the OAL is at this point, to be sure well under the SAAMI length of 3.6".