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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
adjusting Creed more type sights
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<blockquote data-quote="Centre Punch" data-source="post: 60677" data-attributes="member: 3048"><p>mlg123,</p><p></p><p>I checked out which sight you mean't at Cabelas site and unfortunately you picked out the worst one when it comes to adjustment. To save yourself a lot of frustration upgrade to the better sights as soon as possible,if you can push it that far get the Soule it is an exquisite sight, a friend of mine had one on his Browning 1885 highwall BPCR. I had the Universal Creedmoor combined with a windage adjustable front sight.</p><p></p><p>All is not lost and although your sight is graduated, without a vernier scale,precise adjustmentis not possible,but there is a formula to help you to calculate the amount of sight elevation equal to 1 moa from a 100yrd zero. Thia all depends on your sight radius,my Sharps had a 34" barrel which gave a sight radius of 40". Here goes;</p><p></p><p> <u>(sight radius x 2 x 3,142)divided by 360 degrees</u> </p><p> 60 minutes per degree</p><p></p><p>Which in the case of my rifle that has a 40" sight radius is</p><p></p><p> <u>40 x 2 x 3,142 divided by 360</u> </p><p> 60</p><p>which= 0.6982 divided by 60 = 0.0116 or aprox .011" per moa.</p><p></p><p>The only way you will be able to find out the amount of moa per revolution of the elevation screw is to measure the threads per inch of the screw and divide it into 1000, i.e.</p><p></p><p>40 tpi = .025" per revolution or approx 2 moa based on the previous calculation</p><p></p><p>If you use the two bottom side screws to adjust the windage i'm afraid you will undo all that you have previously done. /ubbthreads/images/graemlins/frown.gif /ubbthreads/images/graemlins/frown.gif</p><p>this because the side screws cause the post to pivot about the centre screw and the post then scribes an arc from side to side eliminating your elevation settings. It might not matter that much at 100yrds but at 600yrds it can be quite substantial.</p><p>Combine these figures with drop tables for your given bullet, record everything and do your working before you go shooting and you should be somewhere on target.</p><p>The vernier or the Soule sights eliminate all of the problems and you will still have to calculate your amount of elevation per minute of angle but you will be able to move your eyepiece the exact amount. I hope this helps, happy adjusting. /ubbthreads/images/graemlins/smile.gif /ubbthreads/images/graemlins/smile.gif</p><p></p><p>Centre Punch.</p><p></p><p>PS. What rifle are these sights sitting on?</p></blockquote><p></p>
[QUOTE="Centre Punch, post: 60677, member: 3048"] mlg123, I checked out which sight you mean't at Cabelas site and unfortunately you picked out the worst one when it comes to adjustment. To save yourself a lot of frustration upgrade to the better sights as soon as possible,if you can push it that far get the Soule it is an exquisite sight, a friend of mine had one on his Browning 1885 highwall BPCR. I had the Universal Creedmoor combined with a windage adjustable front sight. All is not lost and although your sight is graduated, without a vernier scale,precise adjustmentis not possible,but there is a formula to help you to calculate the amount of sight elevation equal to 1 moa from a 100yrd zero. Thia all depends on your sight radius,my Sharps had a 34" barrel which gave a sight radius of 40". Here goes; <u>(sight radius x 2 x 3,142)divided by 360 degrees</u> 60 minutes per degree Which in the case of my rifle that has a 40" sight radius is <u>40 x 2 x 3,142 divided by 360</u> 60 which= 0.6982 divided by 60 = 0.0116 or aprox .011" per moa. The only way you will be able to find out the amount of moa per revolution of the elevation screw is to measure the threads per inch of the screw and divide it into 1000, i.e. 40 tpi = .025" per revolution or approx 2 moa based on the previous calculation If you use the two bottom side screws to adjust the windage i'm afraid you will undo all that you have previously done. [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/frown.gif[/img] this because the side screws cause the post to pivot about the centre screw and the post then scribes an arc from side to side eliminating your elevation settings. It might not matter that much at 100yrds but at 600yrds it can be quite substantial. Combine these figures with drop tables for your given bullet, record everything and do your working before you go shooting and you should be somewhere on target. The vernier or the Soule sights eliminate all of the problems and you will still have to calculate your amount of elevation per minute of angle but you will be able to move your eyepiece the exact amount. I hope this helps, happy adjusting. [img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img] Centre Punch. PS. What rifle are these sights sitting on? [/QUOTE]
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