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
Twist Rates and Velocity?
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="paphil" data-source="post: 778189" data-attributes="member: 17745"><p>I don't think barrel length causes instability, short pistol barrels are harder to aim and hold steady, but if a pistol has a scope and is held in a vice, it will shoot amazingly well. shorter barrels flex less and also have less time for the exploding powder to push the bullet. That is why we use faster burning powder for pistols than rifles and also why longer barrels give more velocity with the same load. The spin rate is applied in the first few inches of the barrel and is probably responsible for at least some of the throat erosion noted in hot loads. The bullet goes from a dead standstill to about 80 percent of muzzle velocity and 100 percent of spin rate in the first three inches of travel. Some of you pistol guys can correct me on that but most of the torque is applied in the first few inches. Wear and tear on the bullet and the barrel happen at this time. If the bullet doesn't begin to spin immediatly, the jacket would be stripped from the bullet by the rifiling. Faster twist barrels will wear faster than slow twist barrels in the throat area. Variable twist barrels are an interesting concept but I don't have any experience with them.</p></blockquote><p></p>
[QUOTE="paphil, post: 778189, member: 17745"] I don't think barrel length causes instability, short pistol barrels are harder to aim and hold steady, but if a pistol has a scope and is held in a vice, it will shoot amazingly well. shorter barrels flex less and also have less time for the exploding powder to push the bullet. That is why we use faster burning powder for pistols than rifles and also why longer barrels give more velocity with the same load. The spin rate is applied in the first few inches of the barrel and is probably responsible for at least some of the throat erosion noted in hot loads. The bullet goes from a dead standstill to about 80 percent of muzzle velocity and 100 percent of spin rate in the first three inches of travel. Some of you pistol guys can correct me on that but most of the torque is applied in the first few inches. Wear and tear on the bullet and the barrel happen at this time. If the bullet doesn't begin to spin immediatly, the jacket would be stripped from the bullet by the rifiling. Faster twist barrels will wear faster than slow twist barrels in the throat area. Variable twist barrels are an interesting concept but I don't have any experience with them. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rates and Velocity?
Top