06-21-2022, 11:33 PM
I did some with 4166 back then and it worked but it is a little full for some of the other cases I tried it with. I did not experience the length growth that some did in that thread. The velocities I reported on the link posted above were on a hot June day at or very near 100 degrees so velocities were elevated some from the heat. I haven't done much with it since but will use up the rest of the 4166 either in the Grendel or 223 most likely. My loads were more consistent than what I was getting from Hornady factory 123gr SSTs as I saw almost 150fps ES that day with 10 shots over the crono which was much more that I expected.

