Not sure if it’s any help to you, but I just looked in my old (20 years) data book for my TBA built M40A3. It had a Sneider 25” barrel. I had a few cases of the M118LR for it.
Temp was 82* F. 20 rounds fired over the old pro chrono chronograph. High- 2721 fps, low- 2682, average-2701, ES-39, SD-11