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Posted: 12/8/2018 2:08:27 PM EDT
So in trying to find my height over bore or sight heigh, I have a question.
I have bolt diameter divided by 2 I have scope tube diameter divided by 2 Now for the distance “top of bolt in rifle to bottom of scope”. Do I need to measure to the bottom of the scope tube or the bottom of scope center base (where the turrets are). Basically the flat part of the scope is 1.097” and the tube is 1.77”. Which one do I use? |
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Posted: 12/8/2018 4:16:31 PM EDT
[#1]
No need for math. Take a ruler or calipers and measure from center of bolt/bore and go to center of windage knob. Simple, fast and easy and works.
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Posted: 12/8/2018 7:22:55 PM EDT
[#2]
Which is what I’ve done in the past. Saw where there was a formula for getting exact radius and figured it was worth a shot.
Thanks! |
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Posted: 12/8/2018 7:34:04 PM EDT
[#3]
No need to get it down to the third decimal point for sight height. Within a quarter inch is fine but with the way above I can get it to .1". That formula is more of a waste of time or for people who just can't do anything the simple way. LOL
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Posted: 12/8/2018 9:26:22 PM EDT
[Last Edit: KarlSG1]
[#4]
Your height over bore is:
Half of the scope tube diameter + Half of the bolt body diameter + The distance between the bottom of the scope tube body, and the top of the bolt body This assumes that the bolt body is concentric to the bore. There are some designs (mostly rimfires) that have the bolt body not concentric to the bore. |
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Posted: 12/9/2018 8:59:47 PM EDT
[#5]
Quote HistoryOriginally Posted By KarlSG1:
Your height over bore is: Half of the scope tube diameter + Half of the bolt body diameter + The distance between the bottom of the scope tube body, and the top of the bolt body This assumes that the bolt body is concentric to the bore. There are some designs (mostly rimfires) that have the bolt body not concentric to the bore. But as Rob mentioned, this formula is probably not necessary. Was just trying to use it to compare to the measurement I took with my calipers, estimating center of bolt to center of tube. |
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Posted: 12/13/2018 6:39:33 PM EDT
[Last Edit: KarlSG1]
[#6]
I thought I was clear enough when I used the term, "bottom of the scope tube body ". By that, I mean the cylindrical part of the scope that is usually between the rings. The larger boss the turrets mount to are not part of the measurement.
It is true that the formula is largely unnecessary for most applications. The question was asked in the Precision Rifle section, so I wanted to give you a precise answer. Happy shooting! |
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TN, USA
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Posted: 12/17/2018 10:09:32 PM EDT
[#7]
easy ways to get precise answers. your action mfg will tell you the distance from center to top of rail. your ring mfg will tell you the distance from center to top of rail.
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