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
MOA at 400 but can't get on target at 650?
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="freddiej" data-source="post: 1715952" data-attributes="member: 26227"><p>What I am about to suggest I do with great hesitation due to the company I am in and there are so many that disagree with me on this. I had this happen to me while I was shooting 1,000 competitions in California. My rifle was a 1:10" and I started out with 200 and 210 grain slugs with somewhat the same results as you are having but at a bit different ranges. between 600 and 700 yards my groups started opening up with 210 grain slugs, between 800 and 900 yards the 200 grain slugs opened up their groups. this phenomenon is called marginal stabilization. as the slug slows down so does the rotation, when you see a dramatic opening of your groups from one yardage to another your slug is going through a decay of stabilization. normally a 1:10" barrel should stabilize a 180 grain slug out to 1,400 to 1,700 depending on the AOL of the slug. Berger VLD's ruined all that very quickly. the longer the slug the faster the twist needs to be. where the cutoff is for a 1:10" twist ends its stabilizing of a particular slug and the need for a 1:8" twist barrel has changed over the years. from what you are saying your slugs are not stabilizing at or near 600 yards. this can be two reasons. rotational velocity is not fast enough keep the slug stable, or your FPS and your rotation are too slow to ever keep it stable out past 500 yards. I would try a 175 grain Nosler Accu-Bond and run the same 400 and 650 yard shooting. if your gun shoots true at 650 then your gun needs a lighter slug or a faster twist barrel.</p></blockquote><p></p>
[QUOTE="freddiej, post: 1715952, member: 26227"] What I am about to suggest I do with great hesitation due to the company I am in and there are so many that disagree with me on this. I had this happen to me while I was shooting 1,000 competitions in California. My rifle was a 1:10" and I started out with 200 and 210 grain slugs with somewhat the same results as you are having but at a bit different ranges. between 600 and 700 yards my groups started opening up with 210 grain slugs, between 800 and 900 yards the 200 grain slugs opened up their groups. this phenomenon is called marginal stabilization. as the slug slows down so does the rotation, when you see a dramatic opening of your groups from one yardage to another your slug is going through a decay of stabilization. normally a 1:10" barrel should stabilize a 180 grain slug out to 1,400 to 1,700 depending on the AOL of the slug. Berger VLD's ruined all that very quickly. the longer the slug the faster the twist needs to be. where the cutoff is for a 1:10" twist ends its stabilizing of a particular slug and the need for a 1:8" twist barrel has changed over the years. from what you are saying your slugs are not stabilizing at or near 600 yards. this can be two reasons. rotational velocity is not fast enough keep the slug stable, or your FPS and your rotation are too slow to ever keep it stable out past 500 yards. I would try a 175 grain Nosler Accu-Bond and run the same 400 and 650 yard shooting. if your gun shoots true at 650 then your gun needs a lighter slug or a faster twist barrel. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
MOA at 400 but can't get on target at 650?
Top