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Bubble level for rifle
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<blockquote data-quote="Brent" data-source="post: 40969" data-attributes="member: 99"><p>Phil,</p><p>I'll run the numbers, but Dave is I believe running the numbers for 90 deg to exagerate an example as well. How much cant you have in the rifle is not relivant unless you'd just like to know the impact it would have on a shot had you NOT kept it level, and you were sighted in LEVEL. </p><p></p><p>I will disagree with you on one point you made here. </p><p></p><p><strong>Don't forget, all this error is based upon CHANGE FROM NORMAL. If you hold the gun at a 2 degree angle normally, for whatever reason that I cannot possibly understand, then it is only when you hold it otherwise that this ever comes into play</strong></p><p></p><p>Holding at 2 deg cant normally, and zeroed at 100 yards, as soon as you crank in 18 MOA for a farther zero at say 800 yds, what just happened to your zero out farther? It's now off, is it not? </p><p></p><p>Point is, you're at the range, turrets leveled to the action, crosshairs level, bubble level clamped on scope and level too, everythings great, good frame of referance and you're ready to fire. The bubble you notice is off just before the shot. How much? Don't matter at all how much, you straighten it up and fire. You go out to 800 yards, do the same thing. You know the rifle and turrets you're dialing with are level. The main issue is that the center of your crosshair tracks the plumb line from the crosshair to the bore line perfectly, and this intersecting line is kept plumb and not canted. Matching POI with POA is all I'm concerned with, and it being repeatable. </p><p></p><p>We are dealing with angles, and anything that changes them or causes ANY error that CAN BE eliminated is first on my list, anything that can be compensated for is next, but still takes a back seat to those things that can be ELIMINATED. </p><p></p><p>Back with the RSI Lab cant numbers here shortly...</p></blockquote><p></p>
[QUOTE="Brent, post: 40969, member: 99"] Phil, I'll run the numbers, but Dave is I believe running the numbers for 90 deg to exagerate an example as well. How much cant you have in the rifle is not relivant unless you'd just like to know the impact it would have on a shot had you NOT kept it level, and you were sighted in LEVEL. I will disagree with you on one point you made here. [B]Don't forget, all this error is based upon CHANGE FROM NORMAL. If you hold the gun at a 2 degree angle normally, for whatever reason that I cannot possibly understand, then it is only when you hold it otherwise that this ever comes into play[/B] Holding at 2 deg cant normally, and zeroed at 100 yards, as soon as you crank in 18 MOA for a farther zero at say 800 yds, what just happened to your zero out farther? It's now off, is it not? Point is, you're at the range, turrets leveled to the action, crosshairs level, bubble level clamped on scope and level too, everythings great, good frame of referance and you're ready to fire. The bubble you notice is off just before the shot. How much? Don't matter at all how much, you straighten it up and fire. You go out to 800 yards, do the same thing. You know the rifle and turrets you're dialing with are level. The main issue is that the center of your crosshair tracks the plumb line from the crosshair to the bore line perfectly, and this intersecting line is kept plumb and not canted. Matching POI with POA is all I'm concerned with, and it being repeatable. We are dealing with angles, and anything that changes them or causes ANY error that CAN BE eliminated is first on my list, anything that can be compensated for is next, but still takes a back seat to those things that can be ELIMINATED. Back with the RSI Lab cant numbers here shortly... [/QUOTE]
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