Ron, I appreciate your clear explanation.
And you're probably right with
the principle — that
scopes should not be used at close-to-maximum or minimum elevation adjustment. After you posted the illustration from the PrecisionRifleBlog.com, though, I felt like offering an
exception clause to that principle (no, I'm not a lawyer...!
).
From reading that very PrecisionRifleBlog.com I come away with the impression that there are
many shooters who use their scopes far off the optical center — far down toward the minimum, or far up toward the maximum elevation adjustment.
And they do so on heavy recoiling firearms when they make their 1000-yard and mile long shots.
➠ So, this principle or this requirement to
not get close to the extreme ends of the turret adjustments must apply
in general to
▪ cheaper scopes
▪ scopes with capped turrets (which is the manufacturer's way of telling the user that these aren't made for dialing, "just set and forget, use your reticle")
▪ scopes from manufacturers who have a history of poor turrets (Leupold, if I understand correctly)
Of course, you can always
play it safe.
But is that necessary? ➔
The author of the PRS blog above, a competition shooter, is a
science nut at heart, he goes bananas with testing and demanding top performance from his gear and himself. And he non-chalantly tells how
he has only a handful of clicks left on the bottom end of his elevation turret (thanks to canted rails and mounts). He goes on to survey in detail all the gear that will allow you to do the same — and to explain that this is what you need to do in order to dial the elevation needed for those extreme long range shots.
➠ Well, I have been following his advice. My $200 to $500 scopes — all with exposed turrets
— are generally far toward the bottom end of the adjustment. And for some of my longer ranges with low powered guns, I have come close to the top end of the adjustment.
The only scope that failed me when doing this was a $100 scope.
(Of course, I'm not saying there is a guarantee that "no scope above $XXX will get their erector knocked out when maxed out" — scopes fail all the time — warranties are there for a reason. All I'm doing is
I'm following the lead of the PRS shooters and their blog that surveys their practices since years.)
Matthias