zimagold
11-15-2015, 22:19
General Info
I decided to do a head to head comparison of a match 77gr SMK load compared to the new 77gr TMK. Rather than comparing a hand load tuned for a specific barrel, I chose to use Black Hills loadings as a factory "Match" loading. I figured I would share the results if I was going through the work anyways.
Notes on Data:
TMK – Black Hills 77gr TMK 556 Load – New Red Box
SMK – Black Hills 77gr OTM 556 Load – New Red Box
62188
All velocities were recorded separately from group tests using a Magneto Speed attached at the muzzle.
100yrd groups were shot at an indoor range with ammo at room temp (~70F). All groups were shot during a 2 minute interval. Sequence: Fire 5, load 5 more, and fire second group of five. Approximately 10 seconds between rds. I was mainly looking for extreme spread during relatively rapid fire.
600yrd groups were shot outdoors on a 60-65F day with density altitude of 6700-7000ft. Winds were mild at 2-3mph. Shots were taken at a rate of 1rd per 5 minutes. I was attempting to maximize accuracy in a slow fire scenario. Environmental variables were captured using a Kestrel 4500.
Disclaimer: I am by no means an expert. This is a one batch, simple, amateur test with nothing calibrated. Results will vary.
I decided to do a head to head comparison of a match 77gr SMK load compared to the new 77gr TMK. Rather than comparing a hand load tuned for a specific barrel, I chose to use Black Hills loadings as a factory "Match" loading. I figured I would share the results if I was going through the work anyways.
Notes on Data:
TMK – Black Hills 77gr TMK 556 Load – New Red Box
SMK – Black Hills 77gr OTM 556 Load – New Red Box
62188
All velocities were recorded separately from group tests using a Magneto Speed attached at the muzzle.
100yrd groups were shot at an indoor range with ammo at room temp (~70F). All groups were shot during a 2 minute interval. Sequence: Fire 5, load 5 more, and fire second group of five. Approximately 10 seconds between rds. I was mainly looking for extreme spread during relatively rapid fire.
600yrd groups were shot outdoors on a 60-65F day with density altitude of 6700-7000ft. Winds were mild at 2-3mph. Shots were taken at a rate of 1rd per 5 minutes. I was attempting to maximize accuracy in a slow fire scenario. Environmental variables were captured using a Kestrel 4500.
Disclaimer: I am by no means an expert. This is a one batch, simple, amateur test with nothing calibrated. Results will vary.