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
Reloading
Need Help....Heavy Powder Residue On Case...
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="MagnumManiac" data-source="post: 1117455" data-attributes="member: 10755"><p>How many chambers have you cut, personally?</p><p>Do you understand that it is IMPOSSIBLE to change the headspace on a belted cartridge?</p><p>Do you understand that the case on a belted cartridge expands from the front rearwards?</p><p></p><p>ALL belted chambers have generous tolerances for the shoulder, it is NOT required for the first firing, the belt holds headspace correctly.</p><p>As the case fires and pressure builds, the case neck AND shoulder expand well before full pressure is reached. How do I know this? After fireforming numerous cartridges from one size to another with fast pistol powders, if there is sufficient pressure to open the top 2/3rds of the case, this occurrs perfectly with fully formed shoulders, but the pressure isn't quite adequate to blow out the thicker lower case walls. The result is a semi formed case. Pressure follows the least resistance , this also translates to the cartridge case, the thinner sections obturate easier.</p><p>Cases only stretch from ONE cause, excessive headspace, now, this is a general statement, but there are 2 deciding factors when discussing belted cases. Headspade of the belt CANNOT be changed by sizing the case, it is fixed. If it doesn't measure .220" from the front of the belt to the base of the case, and the rifle chamber is longer than this, we have a problem, not only with the excessive belt headspace, but the generous position of the shoulder. </p><p>Now, if you have generous belt headspace AND generous shoulder tolerance, what do you do? If you don't do anything, your cases will stretch and eventually split. </p><p>Simple, forget the belt is there, and headspace off the shoulder, if you get it right, your cases will last far longer than if you get it wrong.</p><p>Just for your information, chambers that have .026" clearance in the shoulder to base measurement on belted chambers have passed through my hands, unintensional, and intensional. The 375 Weatherby I have has more clearance than this when I fireform 300H+H brass in it, it NEVER splits after this, why? I control headspace with the shoulder once it's fireformed.</p><p>Just a bit of knowledge for you to digest.</p><p></p><p>Cheers.</p><p>lightbulb</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1117455, member: 10755"] How many chambers have you cut, personally? Do you understand that it is IMPOSSIBLE to change the headspace on a belted cartridge? Do you understand that the case on a belted cartridge expands from the front rearwards? ALL belted chambers have generous tolerances for the shoulder, it is NOT required for the first firing, the belt holds headspace correctly. As the case fires and pressure builds, the case neck AND shoulder expand well before full pressure is reached. How do I know this? After fireforming numerous cartridges from one size to another with fast pistol powders, if there is sufficient pressure to open the top 2/3rds of the case, this occurrs perfectly with fully formed shoulders, but the pressure isn't quite adequate to blow out the thicker lower case walls. The result is a semi formed case. Pressure follows the least resistance , this also translates to the cartridge case, the thinner sections obturate easier. Cases only stretch from ONE cause, excessive headspace, now, this is a general statement, but there are 2 deciding factors when discussing belted cases. Headspade of the belt CANNOT be changed by sizing the case, it is fixed. If it doesn't measure .220" from the front of the belt to the base of the case, and the rifle chamber is longer than this, we have a problem, not only with the excessive belt headspace, but the generous position of the shoulder. Now, if you have generous belt headspace AND generous shoulder tolerance, what do you do? If you don't do anything, your cases will stretch and eventually split. Simple, forget the belt is there, and headspace off the shoulder, if you get it right, your cases will last far longer than if you get it wrong. Just for your information, chambers that have .026" clearance in the shoulder to base measurement on belted chambers have passed through my hands, unintensional, and intensional. The 375 Weatherby I have has more clearance than this when I fireform 300H+H brass in it, it NEVER splits after this, why? I control headspace with the shoulder once it's fireformed. Just a bit of knowledge for you to digest. Cheers. lightbulb [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Need Help....Heavy Powder Residue On Case...
Top