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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Accuracy Decline Due to Harmonics?
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<blockquote data-quote="Jimhoodag" data-source="post: 897321" data-attributes="member: 39688"><p>I have a .243 Savage Axis that shot 1/2 moa for five years, until I upgraded to a larger, better scope. I must have gotten a lucky barrel on this cheap gun, because two out of five shots would touch at 200 yards with a cheap Redfield 3-9x40 with a laser night light mounted on it. </p><p></p><p>Last week I used the same bases to mount an Elite Bushnell 6-24x50 on Burris Signature zee rings. I am wondering if the smaller scope and laser had the harmonics perfect on the barrel. It is now only shooting one moa. I am shooting the same reloads as before. </p><p></p><p>I moved and had to place my safe in a utility room with no heat or cool. Although I have an electric dehumidifier in the safe, I thought I saw some rust on the guns so I cleaned the bore spotless and it still can't get to sub-moa. I bought some J-B Bore paste and am going to see if that helps.</p><p></p><p>I broke in the barrel and have kept it clean except for leaving it dirty since last spring. I have run no more than 400 rounds down the pipe.</p><p></p><p>My 6.5-284 with a match, select barrel was left a little dirty too, but it took a good cleaning to get it back on.</p><p></p><p>I don't know enough about barrel harmonics to determine if the scope change caused the problem. I tightened the new scope down to specs with a Fat Wrench. I tried fresh reloads and several brands of commercial loads to no avail. Although I am not impressed with the tracking of the Bushnell, its optics are almost as good as my Nightforce. </p><p></p><p>In summary, I don't think it is a cleaning issue as I have used the best copper and carbon cleaners and many patches. I am using the same reloads. I used a cheek rest for the new, higher scope. My 6.5 is shooting 1/4 moa at 400 yards after cleaning - in other words I don't think it is the shooter. Could I have changed the harmonics by changing scopes?</p><p></p><p>Jim Hood</p></blockquote><p></p>
[QUOTE="Jimhoodag, post: 897321, member: 39688"] I have a .243 Savage Axis that shot 1/2 moa for five years, until I upgraded to a larger, better scope. I must have gotten a lucky barrel on this cheap gun, because two out of five shots would touch at 200 yards with a cheap Redfield 3-9x40 with a laser night light mounted on it. Last week I used the same bases to mount an Elite Bushnell 6-24x50 on Burris Signature zee rings. I am wondering if the smaller scope and laser had the harmonics perfect on the barrel. It is now only shooting one moa. I am shooting the same reloads as before. I moved and had to place my safe in a utility room with no heat or cool. Although I have an electric dehumidifier in the safe, I thought I saw some rust on the guns so I cleaned the bore spotless and it still can't get to sub-moa. I bought some J-B Bore paste and am going to see if that helps. I broke in the barrel and have kept it clean except for leaving it dirty since last spring. I have run no more than 400 rounds down the pipe. My 6.5-284 with a match, select barrel was left a little dirty too, but it took a good cleaning to get it back on. I don't know enough about barrel harmonics to determine if the scope change caused the problem. I tightened the new scope down to specs with a Fat Wrench. I tried fresh reloads and several brands of commercial loads to no avail. Although I am not impressed with the tracking of the Bushnell, its optics are almost as good as my Nightforce. In summary, I don't think it is a cleaning issue as I have used the best copper and carbon cleaners and many patches. I am using the same reloads. I used a cheek rest for the new, higher scope. My 6.5 is shooting 1/4 moa at 400 yards after cleaning - in other words I don't think it is the shooter. Could I have changed the harmonics by changing scopes? Jim Hood [/QUOTE]
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Accuracy Decline Due to Harmonics?
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