Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

Testing Friction Reduction of Bullet Coatings

 
LinkBack Thread Tools Display Modes
  #29  
Old 08-10-2012, 04:44 PM
Silver Member
 
Join Date: Nov 2010
Location: Southern United States
Posts: 284
Re: Testing Friction Reduction of Bullet Coatings

Quote:
Originally Posted by Outlaw6.0 View Post
Then you get into the mechanics of compression which I know nothing about of course. my thought process is, when you compress something it has to go somewhere right? When your lead core is totally encapsulated in a jacket, where can it go?

In match hollow point bullets, there is an air space in the front of the bullet. The lead can expand forward.
Reply With Quote

  #30  
Old 08-10-2012, 07:49 PM
Gold Member
 
Join Date: May 2009
Location: Australia
Posts: 736
Re: Testing Friction Reduction of Bullet Coatings

If they said that MoS2 coating did not change velocity then their testing is total crap. It always lowers velocity with the same powder loads . The reduction in friction changes the pressure time curve so the bullet gets out before experiencing the same chamber pressure than the uncoated bullet does .
It's a bit like reducing the powder charge . You have to increase the powder chatge slightly to get back to the same velocity as an uncoated bullet.
I know that sounds odd when friction is being reduced but the push on a bullet is a function of pressure over time , If the bullet moves out easier the bore volume behind the bullet is increased much quicker as compared to the burning rate of the powder and has the effect of lowering the total chamber pressure that the bullet sees before it exits the bore . All else being equal that is .
Then we have the variables of many different types of coating systems that all go under the same names but are very dfferent in chemical make up and application.
Some factory bullets say Moly coated but infact don't have ANY MoS2 on them .
It is one of those things that you do it yourself and if you like it then that is all that matters . If we listened to all the nay sayers few new ideas would see the light of day. I have been using my own Moly coating process for many years and think that it does have some benifits when firing long strings of shots without having to clean . Not every shooting situation suits coated bullets.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Testing Friction Reduction of Bullet Coatings
Thread Thread Starter Forum Replies Last Post
Your input desired on design of barrel friction experiment with bullet coatings Michael Courtney Rifles, Bullets, Barrels and Ballistics 12 11-08-2011 08:35 AM
My take on bullet bc testing goodgrouper Rifles, Bullets, Barrels and Ballistics 2 04-08-2009 06:33 AM
bullet testing....... chucksniper Rifles, Bullets, Barrels and Ballistics 14 07-14-2008 03:48 PM
Bullet Coatings Sako7STW The Basics, Starting Out 15 03-01-2004 03:28 PM
Bullet coatings..Danzac, etc. Rifles, Bullets, Barrels and Ballistics 10 05-21-2003 11:45 PM


All times are GMT -5. The time now is 12:18 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC