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
Hunting
Long Range Hunting & Shooting
Need Help
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="MontanaRifleman" data-source="post: 791064" data-attributes="member: 11717"><p>I don't see where you mention Barometric Pressure? That will make a difference.</p><p></p><p>Things to check...</p><p>-Correct vertical alignment of your scope to your bore, I use a plum bob</p><p>-Actual scope tracking, you can check this by locking your rifle into a rifle vice at a range and checking the travel against a yard stick @ exactly 100 yds from the scope. 120 clicks (30 MOA) should equal 31.41"</p><p>-Accurate scope height.</p><p></p><p>Off the top of my head, the cause appears to be either a tracking problem or an incorrect BC or a combination of things. Your rate of ballistic decay is greater than the BC you're using suggesting the actual BC is lower. Velocity is always suspect.</p><p></p><p>In this case your actual drops vs charted drops are less @ 400 and 500, about the same @ 600 and lower @ 700 and 800.</p><p></p><p>This suggests to me that actual velocity is higher and actual BC lower than programmed.... assuming actual scope height, alignment, and tracking are correct. </p><p></p><p>Also need to know the Barometric Pressure.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 791064, member: 11717"] I don't see where you mention Barometric Pressure? That will make a difference. Things to check... -Correct vertical alignment of your scope to your bore, I use a plum bob -Actual scope tracking, you can check this by locking your rifle into a rifle vice at a range and checking the travel against a yard stick @ exactly 100 yds from the scope. 120 clicks (30 MOA) should equal 31.41" -Accurate scope height. Off the top of my head, the cause appears to be either a tracking problem or an incorrect BC or a combination of things. Your rate of ballistic decay is greater than the BC you're using suggesting the actual BC is lower. Velocity is always suspect. In this case your actual drops vs charted drops are less @ 400 and 500, about the same @ 600 and lower @ 700 and 800. This suggests to me that actual velocity is higher and actual BC lower than programmed.... assuming actual scope height, alignment, and tracking are correct. Also need to know the Barometric Pressure. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Need Help
Top