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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Where to level?!
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<blockquote data-quote="Mikecr" data-source="post: 2235812" data-attributes="member: 1521"><p>[Offset/alignment/square] are different from [cant/skew/tilt/level/plumb].</p><p>It will help to understand them as separate.</p><p></p><p>When you have a bit of offset from scope center/barrel center, what are you going to do about that?</p><p>Tilt the gun, right?</p><p>When your raceway skew means absolutely nothing to scope and barrel centers,, what do you do about that?</p><p>Tilt the gun?</p><p>When your stock appreciates square setting in a rest, but it skews your alignments and bedding is past set?</p><p>Tilt the gun, the bags, the rest or table?</p><p></p><p>Start over:</p><p>Let's say your gun is built,, you have what you have. You level your rest. You mount a scope, and zero it.</p><p>Then you hang a plumb line, which you will shoot top to bottom.</p><p>Where on your gun do you introduce level, so that you can shoot the line without asserting tension in the system (for free recoil firing)?</p><p>I suggest that it's better at the end of the chain (point of aim) than in the middle (a point of build).</p><p></p><p>Put a level freely on the scope tube, and forget all about anything under it.</p><p>Shoot the line, see skew, turn the scoplevel to put you aiming dead on that skew line.</p><p>Next shooting of the plumb line should be right on the money.</p><p>You will never have to readjust that level, for that scope, even if you move that scope to another gun.</p><p></p><p>On point of aim, pick dialing -or- holdover. Crosshairs often have a bit of skew w/resp to dialed elevation.</p><p>And always shoot a line. Do not <em>assume</em> POA=POI. Our bullets are not purely released, but thrown at any angle.</p><p>It's not just vertical or just horizontal.</p><p></p><p>You identified which angle is most consistent through load development, and re-zero'd for it.</p><p>Or, you could re-shoot a plumb line to account for this (if a change,, new load). But you don't have to unless it's a problem beyond zero, across a wide range of distances.</p><p>Like if your barrel/load throws shots at 45degs, and you could shoot every distance out to 1kyd.</p><p>Let's say it prints 3" right, and 3" high at 1kyd. This, after having set your scoplevel as plumb. Then it's not a gun/aimpoint skew, it's a load skew. Be careful to identify it as such, and not Coriolis, spin drift, or mirage. You could shoot a plumb line & adjust your scoplevel at 1kyds. Lotta work, but if you're going to keep this scope/system together, it may be worth it. In this case, I would. But I haven't happened to run into that yet.</p><p></p><p>What I'm getting at here is that this is more dynamic than static.</p><p>You should ultimately prove your level.</p><p>I hunt GHs in hilly NE PA. There, minding level for each shot is vital to success.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2235812, member: 1521"] [Offset/alignment/square] are different from [cant/skew/tilt/level/plumb]. It will help to understand them as separate. When you have a bit of offset from scope center/barrel center, what are you going to do about that? Tilt the gun, right? When your raceway skew means absolutely nothing to scope and barrel centers,, what do you do about that? Tilt the gun? When your stock appreciates square setting in a rest, but it skews your alignments and bedding is past set? Tilt the gun, the bags, the rest or table? Start over: Let's say your gun is built,, you have what you have. You level your rest. You mount a scope, and zero it. Then you hang a plumb line, which you will shoot top to bottom. Where on your gun do you introduce level, so that you can shoot the line without asserting tension in the system (for free recoil firing)? I suggest that it's better at the end of the chain (point of aim) than in the middle (a point of build). Put a level freely on the scope tube, and forget all about anything under it. Shoot the line, see skew, turn the scoplevel to put you aiming dead on that skew line. Next shooting of the plumb line should be right on the money. You will never have to readjust that level, for that scope, even if you move that scope to another gun. On point of aim, pick dialing -or- holdover. Crosshairs often have a bit of skew w/resp to dialed elevation. And always shoot a line. Do not [I]assume[/I] POA=POI. Our bullets are not purely released, but thrown at any angle. It's not just vertical or just horizontal. You identified which angle is most consistent through load development, and re-zero'd for it. Or, you could re-shoot a plumb line to account for this (if a change,, new load). But you don't have to unless it's a problem beyond zero, across a wide range of distances. Like if your barrel/load throws shots at 45degs, and you could shoot every distance out to 1kyd. Let's say it prints 3" right, and 3" high at 1kyd. This, after having set your scoplevel as plumb. Then it's not a gun/aimpoint skew, it's a load skew. Be careful to identify it as such, and not Coriolis, spin drift, or mirage. You could shoot a plumb line & adjust your scoplevel at 1kyds. Lotta work, but if you're going to keep this scope/system together, it may be worth it. In this case, I would. But I haven't happened to run into that yet. What I'm getting at here is that this is more dynamic than static. You should ultimately prove your level. I hunt GHs in hilly NE PA. There, minding level for each shot is vital to success. [/QUOTE]
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