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Joined: May 2002
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Campfire Outfitter
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OP
Campfire Outfitter
Joined: May 2002
Posts: 10,655 Likes: 4 |
OK, this is a basic trig question that has me stumped.
If you change nothing except the height of the mounts, same brand and model, just a higher version, will the point of impact be lower?
Are bigger scopes necessitating higher mounting a reason why bases with built in elevation compensation, such as the 20 minute bases, have become popular? That and longer range shooting, of course.
Stupidity has its way, while its cousin, evil, runs rampant.
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Joined: Dec 2005
Posts: 10,327 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2005
Posts: 10,327 Likes: 3 |
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgiOpen this link TWICE change the ONLY the 'sight height' numbers on one of them, hit calculate on both, scroll down and compare trajectories one to another....
Last edited by Muffin; 10/15/22.
"...A man's rights rest in three boxes: the ballot box, the jury box and the cartridge box..." Frederick Douglass, 1867
( . Y . )
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Joined: Mar 2006
Posts: 14,576 Likes: 8
Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2006
Posts: 14,576 Likes: 8 |
If zeroed at the same distance, trajectory will be slightly different with higher rings. POI will be a bit lower until your zero range, and higher beyond it. Play with the numbers and you’ll see just how much of a difference in trajectory mounting height makes.
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Joined: Nov 2003
Posts: 28,937 Likes: 6
Campfire Ranger
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Campfire Ranger
Joined: Nov 2003
Posts: 28,937 Likes: 6 |
I did a comparison of 1.68" and 2.2". The comparison took four hours. Both were sighted in at 200 yards. The higher rings trajectory was closer to line of sight. It almost appeared as though the higher rings had a higher velocity.
"Only Christ is the fullness of God's revelation." Everyday Hunter
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Joined: Oct 2006
Posts: 1,249
Campfire Regular
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Campfire Regular
Joined: Oct 2006
Posts: 1,249 |
The only difference is that the line of sight is higher over the bore. Look at a scoped AR15, sight it at 25 yards and it will be a lot high at 100 yards, a typical low mounted hunting scope will be just about right for a 200 yard zero.
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Joined: Oct 2022
Posts: 188
Campfire Member
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Campfire Member
Joined: Oct 2022
Posts: 188 |
In practical terms it’s a pretty miniscule difference. Like previously said zeroing an AR with a scope mounted 2.7” above bore at 25 yards will cause really high impacts at 100 yards for example. When zeroed at 100 or 200 yards, theres not a big difference between small differences in ring height.
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Joined: Nov 2014
Posts: 693
Campfire Regular
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Campfire Regular
Joined: Nov 2014
Posts: 693 |
The high line of sight is more of an issue up close than at a distance. I shot this target when I was trying to set up an AR with a light to shoot beavers at night. The grids are 1 1/8"
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