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Lou, Except for the late model Leupold scopes that have the threaded objectives that fit their own filters, most scopes have too small an objective thread for the larger filter sizes typically available for modern SLR lenses. There is quite an array of adapters made that might allow use of the...

1. My first preference in rings is Burris Signature Rings with the Posi-Align inserts http://www.burrisoptics.com/sigrings1.html. These provide secure mounting (even on heavy recoil rifles); do not mar the scope finish; can compensate for imperfect mounting hole to barrel alignment; compensate...

Redding Instant Indicator for 220 and 6mm Beggs Don, For the purposes of using it for a case length or bullet seating comparator as previously discussed you could probably use the Redding 6ppc model. That probably comes with a 0.237 bushing for the bullet seating setup. You will need to also...

Redding Instant Indicator Don, A simplified explanation of the seating and headspace functions follows: The attached picture shows the cut-a-way set up as used to check seating depth. The bushing ID is the ID of the lands (bore diameter). To check head space length of a fire formed case or...

Twud, I use a Redding T-7 with turrets set up for each of the three calibers that I reload. This allows for a one time setup for each die. The sequence as used of dies (Redding except as indicated) is as follows: 1. Decapping die 2. Body die 3. Instant Indicator setup to check cartridge...

Competition Accuracy vs Precision Mike and Hal, In my attachment I was attempting to relate the definition differences using target illustrations typical of the casual local range shooter. However, if we want to apply the definition differences to Benchrest matches then we can use score versus...

Accuracy versus precision Please see the attahed file for a suggest clarification.

Magnification and Resolution John, I have both a 50x and 60x March and having used them for season I can say that I should have gone with 60x for both at all fixed ranges from 100 to 1000 yards. I'm too pressed for time right now to go into the mirage issue but I'll try to add my comments on...

Per the original question: Leupold Competition 45x45 is 20.32 oz (576 g) March fixed all are 21.13 oz (599 g)

Mentoring as payback J. Valentine In a perfect world a safe experienced and patient mentor in a one on one enviroment would be best. Next best would be the same instructor in a small class. To all: Have you volunteered to be a mentor? Does your club put on classes in firearms safety, basic...

Shim Thickness Calculators You may find these helpful: http://www.twincityrodandgun.com/Scope%20Mounting%20Tilt%20Calculator/Scope%20Mounting%20Tilt%20Calculator.htm http://www.twincityrodandgun.com/Sight%20Calc/SightCorrectionCalc.htm

Hovis, Yes I'm an amateur astronomer. If your interest is for occasional family use you want somthing that is very easy to use and setup and small (light & compact) enough to take to a good viewing sight (away from city lights and pollution - dark clear skies are what you want). There are many...

The price listed on the Hawkeye (Gradient Lens) webpage is $85 to have them replace the mirror see http://www.gradientlens.com/order_service.asp I don't see how to beat that price as a "do-it-yourself" project unless your time is worth much less than nothing. Sorry Hovis but I don't have cheap...

I've attached a standard 700 trigger drawing and a three link 700 trigger to illustrate the differences. I don't remember where these came from so my apologies to the originator for the lack of poper citation.

walt k, The technique of using the mirror only requires that the mirror provides for sufficient quality of reflection of the back side of the reticule so that the user can position the reflected image behind the normal view of the reticule. Even a conventional float glass second surface mirror...

First Surface Mirror Source I would suggest the Edmund Optics MIRROR 4-6 WAVE EN AL 75MM DIA part number NT45-616 at $23.00 see: http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=1754&StartRow=21&PageNum=2 These are of more than adequate quality and the coating is actually...

Hovis, You remembered near perfect and did a fine job of explaining the concept ++ For those of you that wish to use a mirror (even if not a first surface mirror) and are having problems with light level – put small spacers of the same thickness at two or three places between the objective rim...

Resolving bullet holes versus "seeing" bullet holes I was not trying to start a semantic battle here but I should have defined my terms better in my last post. As Steve Shelp says many of us have "seen" bullet holes in a target at 1000 yards with fairly modest scopes (the Weaver T-36s I have...

The mirage accessory for the March scopes is called a “Modifier Disk” and screws into the objective housing. The thin disk has an ID of 35 mm. When in place the Modifier Disk reduce the clear aperture from the normal 52 mm to 35 mm and therefore reduces the resolution by 33% which will decrease...

Re: “How important to accuracy is optically centering scope?” As with all optical assemblies with multiple elements (lenses, air gaps and coated surfaces), the optimal arrangement for least distortion, aberrations and internal reflections has all elements on a single common optical axis...