I've completed the initial test for the four powders, H108, H110, WC820, and W296. It is my opinion that
a thorough test would include two separate days with loads produced on separate days, and then validated by tests from another source. So this effort is not offered as a thorough test, but an initial effort to provide some guidelines and insights. My primary insight was the confirmation that you should, as they say, "don't believe what you hear and half of what you see" -- work up the loads using the published factory information. One final disclaimer, experience and factory input says various "lots" of powder vary, and Mil. surplus probably more than Commercial, so when I get another 8lb. jug, I'll run another set of loads.
The only minor surprise that comes from testing the W296 today is that the W296 performed at the same level as an additional .5gr. of H110 did. But then, different lots may give different results
16.5grs
H108 1124 fps, ES 79, SD 28.46, 25yds. .95"
17.0grs
H108 1164 fps, ES 49, SD 19.42, 25yds. .95"
17.5grs
H108 1185 fps, ES 30, SD 12.97, 25yds. 1.4"
18.0grs
H108 1239 fps, ES 11, SD 3.44, 25yds. .70" ****
18.5grs
H108 1271 fps, ES 43, SD 16.63, 25yds. 1.04"
WC820 1232 fps, ES 44, SD 19.20, 25yds. 1.2"
19.0grs
H108 1249 fps, ES 25, SD 10.23, 25yds. NA
WC820 1242 fps, ES 20, SD 8.07, 25yds. 1.3"
19.5grs
H108 1256 fps, ES 60, SD 22.21, 25yds. NA
WC820 1272 fps, ES 39, SD 14.76, 25yds. 1.4"
20.0grs
WC820 1306 fps, ES 31, SD 11.98, 25yds. .9"
H110 1238 fps, ES 72, SD 33.48, 25yds. 1.25"
W296 1269 fps, ES 15, SD 6.46, 25yds. 1.0"
20.5grs
WC820 1349 fps, ES 12, SD 4.99, 25dys. 1.0"
H110 1256 fps, ES 33, SD 15.03, 25yds. 1.2"
W296 1291 fps, ES 25, SD 10.28, 25dys. 1.3"
21.0grs
WC820 1384 fps, ES 5, SD 2.07, 25yds. .85" ****
H110 1289 fps, ES 24, SD 9.95, 25yds. 1.4"
W296 1326 fps, ES 21, SD 7.92, 25yds. 1.0" ****
21.5grs
WC820 1401 fps, ES 34, SD 10.69, 25yds. 1.1"
H110 1320 fps, ES 12, SD 4.39, 25yds. 1.0" ****
W296 1342 fps, ES 29, SD 12.35, 25yds. 1.2"
Soooooo, hope it helps and wasn't too boring.
Dan