Even harder to find load data!
I have initial test results for the folks that have an interest. I'm testing against my standard load, which is a 77 SMK over 23.7 grains TAC, matched cases, Wolf 223 primers. Everything out of an 18" stainless barrel, 1:8 twist. Weather conditions are identical.
My shooting is limited to 600 yards, so I do not calculate past that. These numbers include a 10mph full value wind, which is an arbitrary number just for comparison. 70 degrees, 825' elevation, 3.25" sight above bore.
I use a very light crimp with the Lee FCD. All three loads printed 7/8" for six shots. I did test the 53 Vmax's with and without a crimp. There was no difference on paper at 100 yards. Interestingly I found that the uncrimped loads ran 10 fps faster than the crimped ones. I need to re-test this, and I only used the crimped rounds for these test results.
The 25.4 grain load showed no pressure signs. I'm going to bump up the load to 25.7 grains and run the full test again this weekend. I hope to get both MOA or better accuracy at 3200 fps out of an 18" barrel. If I can, then I'll have a whole bunch of 77 SMK's up for sale real soon.
Baseline load.
77 Sierra Match King, 23.7 grains TAC
Range Velocity Impact Drop ToF Energy Drift
0 2651 -3.25 0 0 1202 0
50 2530 -0.95 0.76 0.06 1094 0.66
100 2418 0 2.87 0.12 1000 1.36
150 2308 -0.54 6.48 0.18 911 2.53
200 2202 -2.73 11.73 0.25 82 4.22
250 2098 -6.72 18.78 0.32 753 6.47
300 1997 -12.69 27.81 0.39 682 9.31
350 1899 -20.85 39.03 0.47 617 12.78
400 1805 -31.41 52.66 0.55 557 16.94
450 1714 -44.66 68.97 0.64 502 21.82
500 1627 -60.86 88.23 0.73 453 27.48
550 1543 -80.36 110.79 0.82 407 33.96
600 1464 -103.5 136.99 0.92 366 41.31
53 Vmax, 25.0 TAC
Range Velocity Impact Drop ToF Energy Drift
0 3052 -3.25 0 0 1096 0
50 2881 -1.1 0.59 0.05 977 0.68
100 2724 0 2.22 0.11 873 1.43
150 2573 -0.08 5.04 0.16 779 2.71
200 2428 -1.47 9.17 0.22 694 4.56
250 2287 -4.34 14.78 0.29 616 7.03
300 2152 -8.89 22.06 0.35 545 10.17
350 2020 -15.32 31.23 0.43 480 14.04
400 1894 -23.88 42.53 0.5 422 18.73
450 1773 -34.87 56.26 0.59 370 24.29
500 1659 -48.64 72.76 0.67 324 30.81
550 1550 -65.57 92.43 0.77 283 38.36
600 1449 -86.12 115.72 0.87 247 47.03
53 Vmax, 25.4 TAC
Range Velocity Impact Drop ToF Energy Drift
0 3131 -3.25 0 0 1154 0
50 2957 -1.13 0.56 0.05 1029 0.68
100 2797 0 2.12 0.1 921 1.4
150 2643 0.01 4.79 0.16 822 2.63
200 2495 -1.23 8.71 0.22 733 4.42
250 2353 -3.86 14.03 0.28 652 6.8
300 2215 -8.08 20.93 0.35 577 9.83
350 2082 -14.07 29.61 0.42 510 13.56
400 1953 -22.09 40.31 0.49 449 18.07
450 1830 -32.38 53.28 0.57 394 23.42
500 1712 -45.28 68.87 0.65 345 29.69
550 1600 -61.15 87.42 0.74 301 36.96
600 1495 -80.42 109.37 0.84 263 45.3