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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="Augustus" data-source="post: 190693" data-attributes="member: 10142"><p>I have seen some lively debates concerning this topic and this may start another one you will probably see there are those who believe in it and correct for it and those that dont. Personally I believe at distances under 500 yds you wont notice it much. At 1000 it can be substantial, around 1 moa. The problem can be masked or compounded by how your scope is set up. I set my scopes up by using a rail type base, I then put a bubble level on it and mount the scope. Before you tighten the scope in the rings go downrange and set up a verticle line that you know is plumb. I use grey duct tape on a 4' by 6' piece of cardboard attached to a target frame. Put a plumb line from top to bottom then stretch the duct tape along the line. Now you can look through your scope and cant the rifle until the rail level indicates level, at the same time twist the scope in the rings until the verticle crosshair of the reticle is centered in the duct tape from top to bottom. The longer distance this is done the better. All my scopes have holdover type reticles so I dont have to worry if the reticle is canted inside the scope. If you are a clicker you need to make sure it tracks OK. Now and only now can you form an opinion about spin-drift. I notice about 1 moa at extended ranges. If shooting South at 1000 you will see around two inches added to that because of the earths rotation, shooting North about that much less. We are talking about right hand twists and the effects will vary due to differences in twist rates, velocity and bullet design. One of the icons in longrange shooting actually cants his scope to compensate for spin drift. If your scope is canted counter-clockwise it is compensating, if it is canted clockwise it will be making the drift appear to be worse. The best advice I can give you is to set your rig where the reticle is not canted one way or the other then go burn some rounds in perfectly calm conditions. This way you can make up your own mind.</p></blockquote><p></p>
[QUOTE="Augustus, post: 190693, member: 10142"] I have seen some lively debates concerning this topic and this may start another one you will probably see there are those who believe in it and correct for it and those that dont. Personally I believe at distances under 500 yds you wont notice it much. At 1000 it can be substantial, around 1 moa. The problem can be masked or compounded by how your scope is set up. I set my scopes up by using a rail type base, I then put a bubble level on it and mount the scope. Before you tighten the scope in the rings go downrange and set up a verticle line that you know is plumb. I use grey duct tape on a 4' by 6' piece of cardboard attached to a target frame. Put a plumb line from top to bottom then stretch the duct tape along the line. Now you can look through your scope and cant the rifle until the rail level indicates level, at the same time twist the scope in the rings until the verticle crosshair of the reticle is centered in the duct tape from top to bottom. The longer distance this is done the better. All my scopes have holdover type reticles so I dont have to worry if the reticle is canted inside the scope. If you are a clicker you need to make sure it tracks OK. Now and only now can you form an opinion about spin-drift. I notice about 1 moa at extended ranges. If shooting South at 1000 you will see around two inches added to that because of the earths rotation, shooting North about that much less. We are talking about right hand twists and the effects will vary due to differences in twist rates, velocity and bullet design. One of the icons in longrange shooting actually cants his scope to compensate for spin drift. If your scope is canted counter-clockwise it is compensating, if it is canted clockwise it will be making the drift appear to be worse. The best advice I can give you is to set your rig where the reticle is not canted one way or the other then go burn some rounds in perfectly calm conditions. This way you can make up your own mind. [/QUOTE]
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