system in hunting are in the minority. This aspect of scope adjustment has con- tinued to haunt a multitude of shooters. Some scope companies have or are
making an effort to stabilize the erector systems by strengthening the erector return spring or incorporating lock systems. Burris has had the Posi-lock for some time, and it appears Leupold will or has announced an innovative self-locking turret system. Other manu- facturers obviate the problem with plain old precision workmanship. Most are admittedly aware problems exist. The bench rest shooters settle the
matter of wandering reticles by apply- ing pressure directly to the erector tube opposite the turrets. This holds the erector tube in place. Some benchrest shooters go as far as to epoxy the erec- tor tubes in place, which precludes any repair to the erector tube if needed. Of course, these are extreme measures where quarter minute or under accuracy is demanded to win tournaments. Reducing or eliminating problems
associated with scope-turret, erector lens apparatus will provide solace in the elimination of scope sighting woes
for many shooters and hunters. As a note worthy of mention,
always complete the windage and el- evation adjustments with a clockwise screw thrust. This pushes the screw firmly against the erector tube, as op- posed to the return springs doing this function. You will always arrive at a more precision adjustment in this way as you obviate the effects of a sluggish leaf spring thrust. If you want to go up or right with the reticle, simply go past your desired setting and turn the dial clockwise for final adjustment. This maneuver works with nearly all scopes regardless of price or quality. EntEr thE VariablE PowEr ScoPE The variable power scope was
a most welcome introduction for the hunter/shooter … a luxury we older shooters didn’t have for a time. It en- ables a shooter to view targets, both near and far, with the same scope … a real benefit for a varmint hunter. The user simply turns a graduated power ring, thus altering the focal length of the scope. Essentially what we have here is a scope within a scope. Power changes are made by turning a calibrated power
ring, incorporating a spiral tube within the erector lens system, whereby the central lens cell is moved, relative to the forward lens, by turning the external ad- justment dial locked into the spiral tube or zoom lens. As the zoom lens slides through its spiral slots during power ad- justment, it can cause untoward reticle shift from the aim point on target. This is essentially a tolerance defect within the sleeves of the zoom system. Yet the sleeves must have a given tolerance for workability and function. Unfortunately, the moving parts
used in the function of all too many vari- able power scopes are a further cause for reticle shift. This is a serious matter, par- ticularly for a long-range shooter who has his rifle sighted in and continues to use it. A relatively high percentage of scopes that I have tested displayed some perceptible reticle shift easily measured with the scope on the collimator as viewed with parallax removed. As previously mentioned, my ear-
lier study included 18 scopes, whereas subsequent tests included nearly 200 scopes. In those variable power scopes tested for reticle shift, more than half
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