Whatever you find, thanks. Data for it is not easy to find these days, so the more the better from as many different sources as possible is the order of the day I think.
Sierra emailed me a PDF of their 6.5x50 data. I got both NRA and Hdy data on line.
Looking at Sierra's data and some from NRA's Handloading which pretty much agree, I have doubts about what Hornady published and would like some other sources for comparison. The charge weights vs. measured velocities are very different for the same powders, and considering almost identical components and test rifles in all three tests I want do do some more checking. I know it's not at all unusual to see differences in published data from different sources, some of which are possibly no longer valid due to powder formulation changes over time, so the more data the better. Almost 40 years of handloading has taught me to trust Sierra's numbers, and in all truth I have never been a big fan of anything Hornady, but I'd like to see what some other sources have to say.
Other names for the round are the 6.5 Jap and the 6.5 Arisaka.