Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Classifieds
Media
New media
New comments
Search media
Log in
Register
What's New?
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Navigation
Install the app
Install
More Options
Advertise with us
Contact Us
Close Menu
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
.
Forums
The Range
NFA & Class III Discussion
quietest suppressed centerfire pistol carteridge
Search titles only
By:
Reply to Thread
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Glocktogo" data-source="post: 1280691" data-attributes="member: 1132"><p>The difference you're noticing is a direct result of the bore diameter of the gun and suppressor. A 9mm bore is only 88% of a .40 bore and only 78% of a .45 bore. Those are significant percentage increases that allow more of the expanding propellant gasses (which are supersonic even though the bullet is not) to exit the suppressor. This is one of the reasons a suppressed turnbolt .308 sounds so mellow. The exit bore on that is only 68% of a .45. </p><p></p><p>So long as the efficiency and volume of a suppressor can effectively handle most of the propellant gasses, what you're left with is what is directly behind the bullet upon exit, and the bullet itself if supersonic. A bullet with a high Ballistic Coefficient (BC) will be quieter than one with a low BC, because they generally displace less air. What air they do displace is less turbulent. So a short fat 230gr .45 bullet is naturally going to be louder than a long skinny 147gr 9mm bullet. </p><p></p><p>Just remember, the bullet and powder aren't actually making noise. The noise comes from how they move the atmosphere they're moving through, and how that atmosphere closes the void left in their wake.</p><p></p><p>The only way to make a suppressed .45 quieter is to use faster burning powders that expand as completely as possible withing the barrel and suppressor, or use less powder overall. Keep in mind that faster burning powders will also burn more completely before the action unlocks than a slower powder. Some of the noise you're hearing is coming out the back end and not the end of the can. If you watch a pistol firing in low light on a high speed camera, you'll usually see propellant gasses burning as they come out of the ejection port, particularly if it's a hot load. One caveat would be to use enough powder to get the case mouth to expand, sealing up the back end better. The more propellant gasses that leak out around the case, the more soot you'll have in the gun and a corresponding increase in noise (though slight).</p></blockquote><p></p>
[QUOTE="Glocktogo, post: 1280691, member: 1132"] The difference you're noticing is a direct result of the bore diameter of the gun and suppressor. A 9mm bore is only 88% of a .40 bore and only 78% of a .45 bore. Those are significant percentage increases that allow more of the expanding propellant gasses (which are supersonic even though the bullet is not) to exit the suppressor. This is one of the reasons a suppressed turnbolt .308 sounds so mellow. The exit bore on that is only 68% of a .45. So long as the efficiency and volume of a suppressor can effectively handle most of the propellant gasses, what you're left with is what is directly behind the bullet upon exit, and the bullet itself if supersonic. A bullet with a high Ballistic Coefficient (BC) will be quieter than one with a low BC, because they generally displace less air. What air they do displace is less turbulent. So a short fat 230gr .45 bullet is naturally going to be louder than a long skinny 147gr 9mm bullet. Just remember, the bullet and powder aren't actually making noise. The noise comes from how they move the atmosphere they're moving through, and how that atmosphere closes the void left in their wake. The only way to make a suppressed .45 quieter is to use faster burning powders that expand as completely as possible withing the barrel and suppressor, or use less powder overall. Keep in mind that faster burning powders will also burn more completely before the action unlocks than a slower powder. Some of the noise you're hearing is coming out the back end and not the end of the can. If you watch a pistol firing in low light on a high speed camera, you'll usually see propellant gasses burning as they come out of the ejection port, particularly if it's a hot load. One caveat would be to use enough powder to get the case mouth to expand, sealing up the back end better. The more propellant gasses that leak out around the case, the more soot you'll have in the gun and a corresponding increase in noise (though slight). [/QUOTE]
Insert Quotes…
Verification
Post Reply
Forums
The Range
NFA & Class III Discussion
quietest suppressed centerfire pistol carteridge
Search titles only
By:
Top
Bottom