Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Pro2A" data-source="post: 1896170" data-attributes="member: 17889"><p>JE CUSTOM, as you point out, vertical displacement for an angle (MOA or MIL) grows linearly with distance as it is line of sight. However, the cant error is not linear with distance as it relates to ballistic trajectory. . Cant error magnifies as one dials more for greater distance as the come ups increase because cant results in only coming up vertically a percentage of the amount dialed with a growing amount of horizontal displacement. Cant yields a reduction in actual vertical displacement dialed and a growing horizontal displacement. A flatter shooting bullet doesn't get impacted as much by cant because less come ups are dialed....yielding less error. Similar to the impact of inaccurate turret adjustments tested by the tall target test, and resulting scaling required to get accurate come ups. In Shooter's MOA (1.0" @ 100yds) 1MOA at 100yds = 1"; 2" @ 200yds...10" @ 1000yds. However, cant error grows with distance (not linear) in proportion to the come ups of the specific caliber/bullet combination. The more come ups required the more the cant error...ie. between two calibers. There is more horizontal error than vertical error from 0deg (true vertical) cant until 45deg. At 45deg the horizontal and vertical error are equal. Beyond 45deg to 90deg the relationship reverses with vertical error being greater than horizontal error. Cant is represented by the clock hand as it moves off of vertical at 12 0'clock. This is easy to visualize with a clock hand tip moving off of 12 o'clock toward 3 o'clock. Look at the horizontal and vertical displacement segments of hand tip movement. Actual dialing movement is along the clock hand. Totally vertical at zero cant (12 o'clock). Declining vertical movement and growing horizontal displacement as the clock hand moves away from 12 0'clock toward 3 0'clock.</p></blockquote><p></p>
[QUOTE="Pro2A, post: 1896170, member: 17889"] JE CUSTOM, as you point out, vertical displacement for an angle (MOA or MIL) grows linearly with distance as it is line of sight. However, the cant error is not linear with distance as it relates to ballistic trajectory. . Cant error magnifies as one dials more for greater distance as the come ups increase because cant results in only coming up vertically a percentage of the amount dialed with a growing amount of horizontal displacement. Cant yields a reduction in actual vertical displacement dialed and a growing horizontal displacement. A flatter shooting bullet doesn't get impacted as much by cant because less come ups are dialed....yielding less error. Similar to the impact of inaccurate turret adjustments tested by the tall target test, and resulting scaling required to get accurate come ups. In Shooter's MOA (1.0" @ 100yds) 1MOA at 100yds = 1"; 2" @ 200yds...10" @ 1000yds. However, cant error grows with distance (not linear) in proportion to the come ups of the specific caliber/bullet combination. The more come ups required the more the cant error...ie. between two calibers. There is more horizontal error than vertical error from 0deg (true vertical) cant until 45deg. At 45deg the horizontal and vertical error are equal. Beyond 45deg to 90deg the relationship reverses with vertical error being greater than horizontal error. Cant is represented by the clock hand as it moves off of vertical at 12 0'clock. This is easy to visualize with a clock hand tip moving off of 12 o'clock toward 3 o'clock. Look at the horizontal and vertical displacement segments of hand tip movement. Actual dialing movement is along the clock hand. Totally vertical at zero cant (12 o'clock). Declining vertical movement and growing horizontal displacement as the clock hand moves away from 12 0'clock toward 3 0'clock. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
Top