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
AR15/10 Rifles
What learned over time building AR's
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="budlight" data-source="post: 3088770" data-attributes="member: 2939"><p>Velocity increases with barrel length. going from 16 inches to 20 inches can be in excess of 300 fps. As velocity goes up with the same twist rate so does bullet RPM. Excessive rpm will make a bullet unstable to the point that it is flying through the air at odd angles. When sighting in my 20 inch it would splatter all over the paper with keyholing. The bullets would be flying sideways. My buddy with a 16 7:1 shooting my loaded 55 gr got typical holes. So I down loaded to under 2800 FPS the same speed as the 16 inch barrel and it punched round holes.</p></blockquote><p></p>
[QUOTE="budlight, post: 3088770, member: 2939"] Velocity increases with barrel length. going from 16 inches to 20 inches can be in excess of 300 fps. As velocity goes up with the same twist rate so does bullet RPM. Excessive rpm will make a bullet unstable to the point that it is flying through the air at odd angles. When sighting in my 20 inch it would splatter all over the paper with keyholing. The bullets would be flying sideways. My buddy with a 16 7:1 shooting my loaded 55 gr got typical holes. So I down loaded to under 2800 FPS the same speed as the 16 inch barrel and it punched round holes. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
What learned over time building AR's
Top