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Tang sight MOA's ? (Read 15013 times)

boats Frequent Elocutionist Offline Posts: 7729 Location: Virginia Joined: Apr 23^rd, 2004	Re: Tang sight MOA's ? Reply #15 - May 12^th, 2016 at 3:22pm	Print Post
	I typed the formula from memory. Let's try it two ways 18 inch sight spacing the Lyman chart says .005 = 1 moa. They don't have 36 inch spacing but can get it from doubling the 18 inch spacing, .005 so 36 inch spacing .01 sight movement = 1 moa on target 36 inch sight radius divided by 3600 (inches in 100 yards) .01 sight movement = 1 moa on target. Same result as the Lyman chart Sound right now ? Boats


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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Tang sight MOA's ? Reply #16 - May 12^th, 2016 at 8:28pm	Print Post
	cuslog wrote on May 12^th, 2016 at 2:03pm: Schuetzenmiester wrote on May 10^th, 2016 at 4:47pm: It is a simple matter to calculate the exact MOA for your rifle. Send your sight radius and the amount of vertical or horizontal movement of a graduation and/or a movement of made by one revolution of your knob and I will do it. Sight radius is 31", TPI of both screws is 32 or .03125" per revolution. Math / Geometry / Trig is not my strong suit and I don't think I have room for anymore markings or stamps small enough if I did. Interesting to "know" the numbers though. Thanks, Howard One revolution is 3.6 minutes. A minute of angle is 1.047" at 100 yards, 2x that at 200 ect. I always rounded them off to 1" per minute at 100, 2" at 200 ect. You are only 1/2" off at 1000 yds

	"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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oneatatime Frequent Elocutionist Offline Posts: 4473 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Tang sight MOA's ? Reply #17 - May 12^th, 2016 at 8:31pm	Print Post
	OK. So to answer the question, how much does one graduation on the tang sight move the placement on the target? We have: Movement at 100 yards = Graduation in thousandths of an inch/(Sight Radius in inches/3600)


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CajunRebel Oldtimer Offline Posts: 694 Location: Alexandria, VA Joined: Nov 18^th, 2007	Re: Tang sight MOA's ? Reply #18 - May 12^th, 2016 at 8:38pm	Print Post
	One revolution is 3.6 minutes? The sight is configured in MILS.


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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Tang sight MOA's ? Reply #19 - May 12^th, 2016 at 9:04pm	Print Post
	oneatatime wrote on May 12^th, 2016 at 8:31pm: OK. So to answer the question, how much does one graduation on the tang sight move the placement on the target? We have: Movement at 100 yards = Graduation in thousandths of an inch/(Sight Radius in inches/3600) Good question What is the measurement for a graduation?

	"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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oneatatime Frequent Elocutionist Offline Posts: 4473 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Tang sight MOA's ? Reply #20 - May 13^th, 2016 at 12:37am	Print Post
	OK, here's the definitions: Graduation - (sciences) A marking (i.e. on a container) indicating a measurement (like on a sight? We are speaking of a scientific process here - math is still a science). Gradation - A calibration marking So in the lab we have a graduated cylinder (it has markings indicating a measurement). Never heard of a gradated cylinder. Your tang sight may have gradations but mine has graduations. But feel fee to use whichever floats your boat. In either event, when you rotate the elevation screw enough to move the sight index from one vernier position to the next, how much change in elevation of the rear sight have you accomplished?


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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Tang sight MOA's ? Reply #21 - May 13^th, 2016 at 1:51am	Print Post
	Nice catch But until there are defined by accurate measurement, we are still in the process of graduating

	"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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jy3855 Senior Forum Member Offline Posts: 368 Location: California Joined: Jul 13^th, 2015	Re: Tang sight MOA's ? Reply #22 - May 13^th, 2016 at 5:35pm	Print Post
	Boats, 36/3600 = .01 then .01 X .01"sight movement = .0001" change in bullet strike - somethings not right 3600/36 = 100 then 100 X .01" sight movement = 1" change in bullet strike - sounds better so the formula should be: target distance(in.)/sight radius(in.) X rear sight movement(in.) = change in bullet strike in inches at target distance


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oneatatime Frequent Elocutionist Offline Posts: 4473 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Tang sight MOA's ? Reply #23 - May 14^th, 2016 at 11:59pm	Print Post
	By Jove, I think he's got it! And it's the same result as: Movement on the target = movement of the rear sight in inches divided by (sight spacing in inches/distance to target to inches) as I said but I like the way he did it better.
	« Last Edit: May 15^th, 2016 at 12:12am by oneatatime »

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gunlaker Frequent Elocutionist Offline Posts: 2609 Location: lower mainland, B.C. Joined: Dec 13^th, 2010	Re: Tang sight MOA's ? Reply #24 - Jun 20^th, 2016 at 10:59am	Print Post
	Howard it was good to meet you at the match. Building your own rifle including action and sights is an outstanding way to get into the sport. That was some pretty impressive work, and some good shooting too. Chris.


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John Boy Ex Member	Re: Tang sight MOA's ? Reply #25 - Jun 20^th, 2016 at 1:42pm	Print Post
	How to Read a Vernier Sight ... (You need to *Login* or *Register* to view media files and links) (You need to *Login* or *Register* to view media files and links)


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John Boy Ex Member	Re: Tang sight MOA's ? Reply #26 - Jun 20^th, 2016 at 5:32pm	Print Post
	And for the other rear tang sights - that I personally abhor ... "The Marble Arms® Peep Tang Sight is adjustable for windage and elevation. The adjustments are micrometer precise. Each firm detent click equals four-tenths of an inch movement at 100 yards."


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cuslog Senior Forum Member Offline Posts: 263 Location: Calgary, Alberta Joined: Dec 29^th, 2011	Re: Tang sight MOA's ? Reply #27 - Jun 20^th, 2016 at 10:11pm	Print Post
	gunlaker wrote on Jun 20^th, 2016 at 10:59am: Howard it was good to meet you at the match. Building your own rifle including action and sights is an outstanding way to get into the sport. That was some pretty impressive work, and some good shooting too. Chris. Hey Chris; Thanks, good meeting you too - always good to put a face to a name. If you're ever up Salmon Arm way, touch base, stop in for a visit, come to the Salmon Arm range, whatever. Howard


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gunlaker Frequent Elocutionist Offline Posts: 2609 Location: lower mainland, B.C. Joined: Dec 13^th, 2010	Re: Tang sight MOA's ? Reply #28 - Jun 20^th, 2016 at 11:28pm	Print Post
	I'll definitely look you up if I'm in the area. Chris.


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John in PA Oldtimer Offline Posts: 590 Location: Hollidaysburg, PA Joined: Nov 3^rd, 2009	Re: Tang sight MOA's ? Reply #29 - Jun 24^th, 2016 at 9:27pm	Print Post
	Schuetzenmiester wrote on May 10^th, 2016 at 4:47pm: It is a simple matter to calculate the exact MOA for your rifle. Send your sight radius and the amount of vertical or horizontal movement of a graduation and/or a movement of made by one revolution of your knob and I will do it. Exactly! MOA vs movement of tang sight will vary depending on distance between sights. It will be identical for guns with the same sight radius, assuming sights are marked in identical increments.

	John Wells Hollidaysburg, PA Peabody and Peabody-Martini's Wanted!
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