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Hunting
Long Range Hunting & Shooting
extreme spin drift
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<blockquote data-quote="John McNab" data-source="post: 1125515" data-attributes="member: 33009"><p>Have had the identical problem with both old target rifles converted to scope use (home gunsmiths working on Omark 44's) and Remington hunting rifles. Problem was incorrect alignment of scope bases or rails and/or mounts and barrell as per Porwath above. Get a 1" diameter length of dead straight aluminium tube (extendable sign poles are made from good quality tube) cut it the length of you barrell + a foot or so. Get a good set of 1" mounts and a good base you know are true, and mount the the whole lot on the rifle with the tube end just overhanging the muzzle. Use your Wheeler to set the rifle up dead straight up and down. Observe from both muzzle and butt end looking at the alignment of the tube to the barrell, even a tiny side to side miss alignment will be obvious, and the cause of the problem. Leave the rifle set up like that and take to your gunsmith so he can see the problem, he'll sort it by over drilling the mount screws in the right alignment and threading them for the next size screws. Have once seen it caused by the barrell thread cut not square to bore, but thats really rare.</p></blockquote><p></p>
[QUOTE="John McNab, post: 1125515, member: 33009"] Have had the identical problem with both old target rifles converted to scope use (home gunsmiths working on Omark 44's) and Remington hunting rifles. Problem was incorrect alignment of scope bases or rails and/or mounts and barrell as per Porwath above. Get a 1" diameter length of dead straight aluminium tube (extendable sign poles are made from good quality tube) cut it the length of you barrell + a foot or so. Get a good set of 1" mounts and a good base you know are true, and mount the the whole lot on the rifle with the tube end just overhanging the muzzle. Use your Wheeler to set the rifle up dead straight up and down. Observe from both muzzle and butt end looking at the alignment of the tube to the barrell, even a tiny side to side miss alignment will be obvious, and the cause of the problem. Leave the rifle set up like that and take to your gunsmith so he can see the problem, he'll sort it by over drilling the mount screws in the right alignment and threading them for the next size screws. Have once seen it caused by the barrell thread cut not square to bore, but thats really rare. [/QUOTE]
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