You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
B
BrentD
Guest
That got me to thinking about the old Unertl scopes with over 12" between bases. Rimfire doesn't put much heat in the bbl. With the mounts so far apart with the Unertl type scopes i was thinking and maybe i'm wrong -with the mounts being so far apart if anything moves maybe there is less POI shift. It seems to me with a single mt a slight movement would change the POI a lot more than if the mts are far apart. What am i missing here?
have we gone full circle and did Unertal have it right?
thanks joe
joe, Standard mounting distance for Unertl scopes and similar Lyman STS or Fecker scopes is 7.25" They can be different but this usually is the correct distance to produce 0.25 MOA clicks.
I think there would be less movement with the older scopes because they would slide as they expand in the heat. The argument here seems to be that the scopes with fixed mounts are bending.
FWIW, a lot of these older scopes have steel tubes. That being the case, they would expand at the same rate as the action/barrel and thus would not be experiencing this binding/bending. If this heating issue is a big deal it would seem to be a really good argument for steel tubes of as near the same alloy as the action or barrel as possible.
The "sun up, sights up" routine seems to be in direct contradition to Beau's experience. I think what Beau describes is due to the light inducing a greater vertical component to air circulation caused by light being coverted to heat and being reflected by the ground. The upward mirage causes the target to appear higher than it really is, and hence one hits higher on the real target.
The "sun up, sights up" routine seems to be in direct contradition to Beau's experience. I think what Beau describes is due to the light inducing a greater vertical component to air circulation caused by light being coverted to heat and being reflected by the ground. The upward mirage causes the target to appear higher than it really is, and hence one hits higher on the real target.
I was taught slightly different phrases "Suns up, bullets up" and the opposite "Suns down, bullets down". At the time I was given the same mirage explanation you give here. I was given the advice back then by a pretty good silhouette shooter, I think it was good and has worked well for me.
Sighters are really nice when allowed aren't they!