56.55 - 3201
57 - 3240
57.5 - 3263
58 - 3278
58.5 - 3305
59 - 3355
59.5 - 3356
60 - 3370
60 - 3377 (was 3370 an hour ago)
60.5 - 3390
61 - 3427
61.5 - 3442
Above is my velocity testing in the yard with R23 in a 6.5 Sherman Short. Above was 74-80 degrees. I took a few loads to the range today to check accuracy. Today was 60. I started with a clean barrel and shot the following at 100 yards in this order.
58.8, 5 shots, 3332 FPS, .511", SD 8.6, ES 19
59, 3 shots, 3358 FPS, .320, SD 4.5, ES 9
59.2, 3 shots, 3352, .248", SD 13.8, ES 28, slight ejector
59.4, 3 shots, 3359, SD 3.3, ES 6, ejector
I'd say the velocity 'node' from single shots fired the other day is quite obviously there. I did see pressure at 59.4 that I did not see the other day.
I'm going to load up a bunch at 59 grains for the SD and lower pressure, verify zero and drop at 600 and go hunting!
All loads R23.
.050" off the lands
26" proof carbon 1:8 with suppressor
6.5 SS
6.5 SS ADG headstamped. Fired once to fireform. Brass still not fully formed.
Fed 210