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
BC issues
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="Bullet bumper" data-source="post: 662548" data-attributes="member: 17844"><p>One single BC at one velocity can not model all that well compared to several BC's and velocities and also the trajectory is affected by local atmospheric and elevation conditions and angle of fire and cant .</p><p>The difference of .5 mill between real world drops and a ballistic program could be a result of some of the above changing .</p><p>Enter the actual measured angle of the barrel above horizontal the elevation above sea level , the temp & humidity at the time of shooting and see if that is a closer match to what drop you are seeing on the targets. </p><p>1 mill = 3.6 inch at 100 yards . So you could mark a target with that inch measurement and place it at exactly 100 yards from the scope sight . Then see at what power it corresponds to 1 mil on the reticule . If the scope is a second focal plane that is. If it is a FFP then it should be correct at all powers as the reticule grows with the power increase .</p><p>.5 mil is about 10.8 inch at 600 yards so make sure you are able to see that difference and aim with precision at 600 when shooting at rocks . Maybe a paper target may give more precision as to exactly what drop you are seeing as you can measure from the center of the group .</p><p>Fist size rocks at 600 yards would be around .5 MOA accuarcy that is very good.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 662548, member: 17844"] One single BC at one velocity can not model all that well compared to several BC's and velocities and also the trajectory is affected by local atmospheric and elevation conditions and angle of fire and cant . The difference of .5 mill between real world drops and a ballistic program could be a result of some of the above changing . Enter the actual measured angle of the barrel above horizontal the elevation above sea level , the temp & humidity at the time of shooting and see if that is a closer match to what drop you are seeing on the targets. 1 mill = 3.6 inch at 100 yards . So you could mark a target with that inch measurement and place it at exactly 100 yards from the scope sight . Then see at what power it corresponds to 1 mil on the reticule . If the scope is a second focal plane that is. If it is a FFP then it should be correct at all powers as the reticule grows with the power increase . .5 mil is about 10.8 inch at 600 yards so make sure you are able to see that difference and aim with precision at 600 when shooting at rocks . Maybe a paper target may give more precision as to exactly what drop you are seeing as you can measure from the center of the group . Fist size rocks at 600 yards would be around .5 MOA accuarcy that is very good. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC issues
Top