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<blockquote data-quote="Fiftydriver" data-source="post: 144183" data-attributes="member: 10"><p>Most conventional factory receivers are 1.350" in diameter, roughly.</p><p></p><p>Then measure your base thickness and the distance from the top of the base to the bottom of the scope tube. </p><p></p><p>THen if your using a scope with a 1" tube add 1/2" to this, if your using a 30 mil scope add 0.591".</p><p></p><p>So you have 1/2 the receiver diameter+base height+ring height+1/2 scope main tube diameter.</p><p></p><p>That will get you your measurement for height above the bore.</p><p></p><p>TO be honest, if you use 1.5" for most conventional scopes mounted in the proper location and 1.7" for the big 56mm objectives, you will be extremely close in most cases.</p><p></p><p>If you are using published load data, I would say there is a good chance your no where near 3200-3250 fps. YOu really need to shoot your load over a chrono so you know for sure. This is really critical for accurate shot predicting at long range.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 144183, member: 10"] Most conventional factory receivers are 1.350" in diameter, roughly. Then measure your base thickness and the distance from the top of the base to the bottom of the scope tube. THen if your using a scope with a 1" tube add 1/2" to this, if your using a 30 mil scope add 0.591". So you have 1/2 the receiver diameter+base height+ring height+1/2 scope main tube diameter. That will get you your measurement for height above the bore. TO be honest, if you use 1.5" for most conventional scopes mounted in the proper location and 1.7" for the big 56mm objectives, you will be extremely close in most cases. If you are using published load data, I would say there is a good chance your no where near 3200-3250 fps. YOu really need to shoot your load over a chrono so you know for sure. This is really critical for accurate shot predicting at long range. Kirby Allen(50) [/QUOTE]
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