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
Barrel length and powder burn rates?
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="AJ Peacock" data-source="post: 285845" data-attributes="member: 4885"><p>Why don't the gases "re-ignite" when you use a faster powder then?</p><p></p><p>If all powders burn by the time a bullet moves 2" down the bore, please explain how (from a physics standpoint) slower powders maintain higher pressure longer than faster pressures. Remember, as the bullet moves down the bore, the volume inside the combustion chamber grows. If the combustion was complete, pressure would drop in direct proportion to the change in the volume behind the bullet. This would mean that we would only need a single powder for everything?</p><p></p><p>You may not trust Quickload and it's data, here is a quotation from a book on Gunpowder that you can consider as well.</p><p></p><p>Gunpowder: Alchemy, Bombards, & Pyrotechnics by Jack Kelly - ISBN 0-465-03718-6 </p><p></p><p>"Smokeless powder burns only on the surfaces of the granules. Larger granules burn more slowly, and the burn rate is further controlled by flame-deterrent coatings which ****** burning slightly. The intent is to regulate the burn rate so that a more or less constant pressure is exerted on the propelled projectile as long as it is in the barrel so as to obtain the highest velocity."</p><p></p><p>I read this to mean that the powder continues to burn as the projectile moves down the barrel, this maintains pressure to create more velocity.</p><p></p><p>AJ</p></blockquote><p></p>
[QUOTE="AJ Peacock, post: 285845, member: 4885"] Why don't the gases "re-ignite" when you use a faster powder then? If all powders burn by the time a bullet moves 2" down the bore, please explain how (from a physics standpoint) slower powders maintain higher pressure longer than faster pressures. Remember, as the bullet moves down the bore, the volume inside the combustion chamber grows. If the combustion was complete, pressure would drop in direct proportion to the change in the volume behind the bullet. This would mean that we would only need a single powder for everything? You may not trust Quickload and it's data, here is a quotation from a book on Gunpowder that you can consider as well. Gunpowder: Alchemy, Bombards, & Pyrotechnics by Jack Kelly - ISBN 0-465-03718-6 "Smokeless powder burns only on the surfaces of the granules. Larger granules burn more slowly, and the burn rate is further controlled by flame-deterrent coatings which ****** burning slightly. The intent is to regulate the burn rate so that a more or less constant pressure is exerted on the propelled projectile as long as it is in the barrel so as to obtain the highest velocity." I read this to mean that the powder continues to burn as the projectile moves down the barrel, this maintains pressure to create more velocity. AJ [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel length and powder burn rates?
Top