So had a play with my new Anschutz today with a newly installed EC V2 Barrel Tuner. I still need to work on my Shooting off a Bench technique but I'm sure I'll get there. Various brands of .22LR tested with some suprising results. All shot a 50m on open air range with a slight breeze from right to left. All Targets are 5 Shot apart from Sheet 1 Target 14 (had a misfire and then the round would not eject so had to hunt for a 'pick' to extract it) and Sheet 2 Target 18 which is 10 shots.
Sheet 1:
Targets 1 to 6 were Norma Tac-22, started with the EC Tuner Flush with the Muzzle and then wound in 1 full turn at a time as I progressed to each Target. I think the flyer on Target 2 was me, after 3 full turns in I shot Target 5, I left the tuner set at 3 turns in and then shot Target 6 (I should have called it a day at that point 🤔). Velocity SD was 12.3 fps, Ave Velocity was 1061.1 fps.
Targets 7 to 11 were Eley Tenex with Targets 7 and 11 repeats of the same Barrel Tuner setting. Velocity SD was 6.4 fps, Ave Velocity was 1069.8 fps.
Targets 12 to 17 were Eley Club. Velocity SD was 9.7 fps, Ave Velocity was 1051.9 fps.
Target 18 to 21 were Eley Club again but a different Batch. Velocity SD was 13.7 fps, Ave Velocity was 1094.9 fps.
Targets 22 to 25 (and Target 1 on Sheet 2). Velocity SD was 8.0 fps, Ave Velocity was 1110.1 fps.
Sheet 2:
Target 1 was the last group of Eley Match where I adjusted the Tuner to 2 1/2 Turns in to see if it made any difference to 3 Turns in (Target 22 Sheet 1)
Targets 2 to 6 were Eley BR Outlaw. Velocity SD was 6.7 fps, Ave Velocity was 1098.7 fps.
Targets 7 to 10 were Eley BR Precision. Velocity SD was 6.3 fps, Ave Velocity was 1104.1 fps.
Targets 11 to 14 were RWS R100. Velocity SD was 9.1 fps, Ave Velocity was 1136.6 fps.
Targets 15 to 17 were SK Match. Velocity SD was 6.8 fps, Ave Velocity was 1065.1 fps.
Target 18 was 10 Rounds of Norma Tac with the Tuner reset to the setting for Target 6 on Sheet 1. Velocity SD was 11.3 fps, Ave Velocity was 1074.0 fps
What did I learn? It is actually quite hard to shoot groups from a Bench, I'm not quite as comfortable as I would like to be but I can work on that. I think the Tuner works to some degree, it definitely affects POI and Group Size. I was getting tired by the end of the afternoon as I started shooting Groups at 09:45 with the last Group was shot at 14:31 (there were lots of stops to allow other shooters to reface Targets) so I think the last Norma Tac Group could have been better. The Garmin Xero works a treat.
Next time out I will see if I can fine tune the Norma Tac and SK Match as that is what I currently have the most of, I may even have a go at sorting by rim size.
Question, how do you measure .22LR Head Space?