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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Tuners- Muzzle Breaks- Barrel Harmonics Management
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<blockquote data-quote="Rardoin" data-source="post: 2228185" data-attributes="member: 114954"><p>I recently had a chance to run a tuner test at the end of a 1000yd match. The three 5 shot groups at 3 tuner settings were shot rapidly (about 3-4 sec between shots) and about 3 minutes between groups/no barrel cooler. Target labelled '0' was the base tuner setting that the load was developed in. The temps were running hotter and I was about 1600 ft ASL where the load was developed about 60ft ASL. The first group shot very good vertical but wide however conditions were quickly switching headwinds so most of that is likely windage. The second group shot about 30% less vertical and tighter horizontal. The next setting showed the load 'blowing up'. This is why I advise shooters to test the tuner and test often/different conditions/repeat testing until a predictable pattern appears; at that point the tuner becomes of great utility. I predicted that the load may shoot the same or a little better on setting '1' (0.001" further away from the muzzle) since the temps were hotter. I also knew that there will be an inflection point where the load would go vertical...and I found it. On what setting would I shoot the match to follow (hypothetically if there was one to follow a few minutes later)??? If I was shooting benchrest I would likely run with setting 1 since I would be rattling off 5-10 shots as fast as I could before conditions changed (much like my test). However since I shoot F-class, which is 20 shots shot over 30 minutes and at least 5-8 seconds between shots and sometimes much longer, I need a tune setting that was not going to blow up if conditions changed during the match. In this case I would twist the tuner between 0 and 1 (or the '1/2' setting). I should be safe there...not the tightest groups possible but well under X-ring of vertical. This match was shot on 0-5pt/V ring ICFRA targets so the .5 moa V ring is like a NRA X-ring.</p><p></p><p>[ATTACH=full]281933[/ATTACH][ATTACH=full]281934[/ATTACH][ATTACH=full]281935[/ATTACH]</p></blockquote><p></p>
[QUOTE="Rardoin, post: 2228185, member: 114954"] I recently had a chance to run a tuner test at the end of a 1000yd match. The three 5 shot groups at 3 tuner settings were shot rapidly (about 3-4 sec between shots) and about 3 minutes between groups/no barrel cooler. Target labelled '0' was the base tuner setting that the load was developed in. The temps were running hotter and I was about 1600 ft ASL where the load was developed about 60ft ASL. The first group shot very good vertical but wide however conditions were quickly switching headwinds so most of that is likely windage. The second group shot about 30% less vertical and tighter horizontal. The next setting showed the load 'blowing up'. This is why I advise shooters to test the tuner and test often/different conditions/repeat testing until a predictable pattern appears; at that point the tuner becomes of great utility. I predicted that the load may shoot the same or a little better on setting '1' (0.001" further away from the muzzle) since the temps were hotter. I also knew that there will be an inflection point where the load would go vertical...and I found it. On what setting would I shoot the match to follow (hypothetically if there was one to follow a few minutes later)??? If I was shooting benchrest I would likely run with setting 1 since I would be rattling off 5-10 shots as fast as I could before conditions changed (much like my test). However since I shoot F-class, which is 20 shots shot over 30 minutes and at least 5-8 seconds between shots and sometimes much longer, I need a tune setting that was not going to blow up if conditions changed during the match. In this case I would twist the tuner between 0 and 1 (or the '1/2' setting). I should be safe there...not the tightest groups possible but well under X-ring of vertical. This match was shot on 0-5pt/V ring ICFRA targets so the .5 moa V ring is like a NRA X-ring. [ATTACH type="full"]281933[/ATTACH][ATTACH type="full"]281934[/ATTACH][ATTACH type="full"]281935[/ATTACH] [/QUOTE]
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Barrel Tuners- Muzzle Breaks- Barrel Harmonics Management
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