Rifle Scopes Scope Centerline to Bore distance.
- Thread starter snajpr
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Re: Scope Centerline to Bore distance.
Take a ruler or caliper and measure it. If this measurement is for your ballistics program it doesn't need to be incredibly accurate.
Take a ruler or caliper and measure it. If this measurement is for your ballistics program it doesn't need to be incredibly accurate.
Re: Scope Centerline to Bore distance.
Assuming a rem 700 type action, take a ruler and eyeball the distance from the little vent hole in front of your ejection port to the gap between the top and bottom half of your rings
Assuming a rem 700 type action, take a ruler and eyeball the distance from the little vent hole in front of your ejection port to the gap between the top and bottom half of your rings
Re: Scope Centerline to Bore distance.
Scope Diameter:
1.00"
30mm = 1.182"
M-770 Bolt Diameter = .700"
Scope diameter/2 + bolt diameter/2 + gap dimension between bottom of scope and top of bolt.
ie
1" scope diameter:
.500 + .350 + X = Scope/Bore dimension.
So, just remember .850" or .941" if you have a 30mm scope then add the gap dimension.
Scope Diameter:
1.00"
30mm = 1.182"
M-770 Bolt Diameter = .700"
Scope diameter/2 + bolt diameter/2 + gap dimension between bottom of scope and top of bolt.
ie
1" scope diameter:
.500 + .350 + X = Scope/Bore dimension.
So, just remember .850" or .941" if you have a 30mm scope then add the gap dimension.
Re: Scope Centerline to Bore distance.
No math needed. Done it the way below for years and works fine for ballistic programs. Vent hole/top of stock to center of windage knob.
For past 100 yards being off a 1/4" won't mean much. It's only when you are shooting inside about 20 yards that there will be a big difference and you need to be as accurate as possible.
No math needed. Done it the way below for years and works fine for ballistic programs. Vent hole/top of stock to center of windage knob.
For past 100 yards being off a 1/4" won't mean much. It's only when you are shooting inside about 20 yards that there will be a big difference and you need to be as accurate as possible.
Re: Scope Centerline to Bore distance.
Ihave a Stiller Tac 30 with Badger rings. The ones I have are not split at the half-way point, so this won't work.I should have said what I had.
Ihave a Stiller Tac 30 with Badger rings. The ones I have are not split at the half-way point, so this won't work.I should have said what I had.
Re: Scope Centerline to Bore distance.
Well, if your scope has a left/right index hash mark on it and the scope is mounted, you can simply reference the distance between index mark on the scope and the action.
Well, if your scope has a left/right index hash mark on it and the scope is mounted, you can simply reference the distance between index mark on the scope and the action.
Re: Scope Centerline to Bore distance.
If your baseline zero is 100 yds, and you have an error of measurement of 1/8" (it would be difficult to err larger, no matter how crude the measure) then your error compared to the trayectory output is only 1/8" at 200 yds, and 9/8" at 1000 yds.
No ballistic program has this accuracy in the real world, so don't sweat it..
If your baseline zero is 100 yds, and you have an error of measurement of 1/8" (it would be difficult to err larger, no matter how crude the measure) then your error compared to the trayectory output is only 1/8" at 200 yds, and 9/8" at 1000 yds.
No ballistic program has this accuracy in the real world, so don't sweat it..
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