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For those using MS Excel - Excel deals with angles in radians for which the formulas become: Angle in MOA = 3437.75 arctan (drop/range) Note that both drop and range need to be in the same units - both in feet, both in yards, both in inches or both in meters. Also the 3437.75 multiplier...

Jackie I received both my 60x and 50x fixed March scopes in early May. I have begun testing them for a planned post. But for now let me say they are AWESOME!! Preliminary test results include: Image quality is fantastic - sharp and clear to edge of field with near perfect color correction...

Angle in MOA = 60 arctan (drop/range) Note that both drop and range need to be in the same units - both in feet, both in yards, both in inches or both in meters. Also the 60 multiplier applies when your calculator [or slide rule for the OLD engineers] gives the arctan in degrees. Or as it was...

215.14 ft (71.71 yards) in 1760 yards = 140 MOA (2.333 degrees)

Hovis, By coincidence, I’ve been doing some testing on scope resolution both for telescopic sights and spotting scopes this year. Early on we found that the variability of visual acuity and color perception of individuals is greater than the actual variations in device resolution. To deal with...

I’ll try to more directly answer the original query by Matt (muslmutt) as I understand his question. First let us simplify the problem by assuming the following hypothetical conditions: 1. Magic rifle and scope is perfectly aligned – mechanically 2. Ammunition is perfectly consistent – 0.000...

The typical ocular assembly (eyepiece) on most scopes provides a corrective range of 3 diopters (-2 to +1 diopter typically) which is adequate for most users. However, for those with visual acuity that is either beter (20/10) or worse (20/40), sharp focus on the reticle may occur at the extreme...

Al, That Leupold 1.5-5x20 is a good illustration of my physics of optics post. The 20 mm objective clear aperture diameter yields a Dawes Resolution (diffraction) limit of 0.097 MOA which would allow for 6 mm bullet holes to be resolved out to 240 yards with good seeing conditions. However, the...

Definitions of terms It would appear that some of the disagreement between posters is based more on differences in their interpretation of the meaning terms used. Resolution = the ability of a telescopic sight to reveal an angular separation of fine details. The greater the aperture of a...

Actual needed magnification - At the risk of offending those of the "my mind is already made up so don't confuse me with the facts" crowd, the following is offered for those that may be interested in the physics of optics that may help answer the question. For the basic physics of optics...

Check out http://www.iveyshooting.com/My_Homepage_Files/Page1.html I use the BR30-050 mounts on both of Stiller Cobra actions. On my 6BR heavy gun the 50 MOA of vertical will handle all I need past 1500 yards without the scope internal adjust. So far the adjustments have been repeatable and...

Per the owners manual and by actual measurement, the "modifier disk" ID is 35mm. This reduces the resolution by about 30% so that the fine detail including the shimmer/glint effects of the mirage are less visable (but then so is the target detail). Also note that use of the modifier disk also...

To be able to resolve 6mm bullet holes at 600 yards you need at least a 50mm objective diameter, very good lenses and very good seeing conditions. For the calculations use this simple calculator: http://www.twincityrodandgun.com/Bullet%20Hole%20Res%20Req/Bullet%20Hole%20Res%20Req.htm Lou is...

Try Bill Shehane at http://scopeusout.com/ for the rests (front and rear) for a heavy gun. Very good products at a fair price and great people to work with.

John, I'm an old timer and sort of comfortable with patching so I have a basic preference for the Patch-Out. It also appears to me that when I do a three step process with Carb-Out, Accelerator, and the Patch-Out I get better results faster. The key to thes cleaners is patience. The Carb-Out...

I've been using the liquid form, Patch-Out, for about 14 months now and prefer it to the foam. They also sell Carb-Out which used before both the Accelerator and Patch-Out helps to both speed up the copper removal and reduce the amount of both products needed.

Synlube 1000 on the web Try ArtMolds at this link: http://www.artmolds.com/product_details.cfm?product_id=198&page=0&cat_name=Release%20Agents

308sako, Thank you. I'm not too humble to appreciate a little flattery now and then. If you are in fact interested in the science behind the scopes we use, I have attached an article I originally did primarily to help those shooters making the transition from low power short range hunting...

308sako I tend to see your “way of fractionalizing the problem” as a very rational way to approach becoming a better shooter. Great shooting, particularly for score or individually aimed shots for group (pickers versus runners), is made up a set of many acts (each including a precise set of...

For the most part I tend to agree with Cheechako that in real shooting conditions the wind and mirage and our ability to read them will trump most other considerations for top tier shooters particularly in competitive shooting situations. As Jackie Schmidt has often noted here, such abilities...