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
Problem with calcs for 4dof and strelok
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="ndking1126" data-source="post: 1959346" data-attributes="member: 26820"><p>I stand by statement on the math however. The OP certainly seems intelligent enough to know that if he looks at the turret he would have noticed that there are 4 hash marks, and not 10, so I am going to assume he has a scope with MIL internals and an MOA turret.</p><p></p><p>I plugged the provided environmentals and velocity into JBM Ballistics and got 171.5" of drop at 905 yards with a 200 yard zero. (I assumed the sight height was 1.8")</p><p></p><p>Because of MIL internals, at 100 yards, each click will move his impact .36" which works out to be 3.258" at 905 yards. </p><p></p><p>When the OP dials up 12.25 MOA (according to the cap), he turned the turret 49 clicks.</p><p></p><p>49 clicks* 3.258" of POI change per click = 159.6" @ 905 yards. 171.5" (actual) - 159.6" (calculated)= 11.9" of variance. So basically our calculators missed by 1 foot. When you factor in a little rounding, possibility of environmentals not being spot on perfect (like pressure already discussed), and the fact that ballistic calculators aren't exactly perfect either, 1 foot at 905 yards is still pretty close. That calculates the number of clicks actually needed was only off by 3.5. To me it adds up.</p></blockquote><p></p>
[QUOTE="ndking1126, post: 1959346, member: 26820"] I stand by statement on the math however. The OP certainly seems intelligent enough to know that if he looks at the turret he would have noticed that there are 4 hash marks, and not 10, so I am going to assume he has a scope with MIL internals and an MOA turret. I plugged the provided environmentals and velocity into JBM Ballistics and got 171.5" of drop at 905 yards with a 200 yard zero. (I assumed the sight height was 1.8") Because of MIL internals, at 100 yards, each click will move his impact .36" which works out to be 3.258" at 905 yards. When the OP dials up 12.25 MOA (according to the cap), he turned the turret 49 clicks. 49 clicks* 3.258" of POI change per click = 159.6" @ 905 yards. 171.5" (actual) - 159.6" (calculated)= 11.9" of variance. So basically our calculators missed by 1 foot. When you factor in a little rounding, possibility of environmentals not being spot on perfect (like pressure already discussed), and the fact that ballistic calculators aren't exactly perfect either, 1 foot at 905 yards is still pretty close. That calculates the number of clicks actually needed was only off by 3.5. To me it adds up. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Problem with calcs for 4dof and strelok
Top