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
"Match" Chamber?
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="J E Custom" data-source="post: 1611120" data-attributes="member: 2736"><p>+1</p><p></p><p>"Match chambers" normally mean tight necks and short throats. Many believe that a sized case should only be .003 larger than a loaded round in the same chamber.</p><p></p><p>This philosophy is the minimum necessary dimension for neck expansion. In many cases it is problematic because you have brass that is different thicknesses and all cases need to be turned to make sure that you actually have .003 thousandths or pressure will rise because the case cant expand enough to release the bullet normally.</p><p></p><p>If you turn your necks to uniform them I recommend .004 thousandths as a minimum and if you don't turn your necks .004 to .005 is recommended. On dangerous game rifles I recommend .006 to .008 for chambering under stressful situations and dirty chambers mainly for safety reasons.</p><p></p><p>Like others, I have worked on many pre-chambered barrels and found the chambers to be poor at best and many of them were special reamers with dimensional problems. and two more that were chambered with a roughing reamer and the neck diameter was two tight and both had no freebore or lead cut in them. the owners could not even use the minimum load data without excessive pressure.</p><p></p><p>I have also set back pre-chambered barrels up to one full thread (.0625) before the chamber cleaned up and became concentric to the bore</p><p></p><p>Set up of the barrel before chambering is very important and time consuming.</p><p></p><p>I am fortunate that I can chamber my self, but others that cant, don't save any money unless they are very lucky and don't have the usual </p><p>problems. One time, (And Only one time) I was rushed and decided to build a rifle for my self and bought a short chambered barrel thinking I could save time. well that didn't work because after I did the set up on the barrel, i found that the maker was not so particular and the chamber was skewed off center to the bore, so I had to cur the barrel tenon completely off and hope I could save what was left of the original chamber. It never shot like it should and has since been replaced.</p><p></p><p>With the experiences that I have had with pre chambered or short chambered barrels, I won't use them at all. so everyone has to decide for themselves which way to go. some are lucky and many are not.</p><p></p><p>Just My Opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1611120, member: 2736"] +1 "Match chambers" normally mean tight necks and short throats. Many believe that a sized case should only be .003 larger than a loaded round in the same chamber. This philosophy is the minimum necessary dimension for neck expansion. In many cases it is problematic because you have brass that is different thicknesses and all cases need to be turned to make sure that you actually have .003 thousandths or pressure will rise because the case cant expand enough to release the bullet normally. If you turn your necks to uniform them I recommend .004 thousandths as a minimum and if you don't turn your necks .004 to .005 is recommended. On dangerous game rifles I recommend .006 to .008 for chambering under stressful situations and dirty chambers mainly for safety reasons. Like others, I have worked on many pre-chambered barrels and found the chambers to be poor at best and many of them were special reamers with dimensional problems. and two more that were chambered with a roughing reamer and the neck diameter was two tight and both had no freebore or lead cut in them. the owners could not even use the minimum load data without excessive pressure. I have also set back pre-chambered barrels up to one full thread (.0625) before the chamber cleaned up and became concentric to the bore Set up of the barrel before chambering is very important and time consuming. I am fortunate that I can chamber my self, but others that cant, don't save any money unless they are very lucky and don't have the usual problems. One time, (And Only one time) I was rushed and decided to build a rifle for my self and bought a short chambered barrel thinking I could save time. well that didn't work because after I did the set up on the barrel, i found that the maker was not so particular and the chamber was skewed off center to the bore, so I had to cur the barrel tenon completely off and hope I could save what was left of the original chamber. It never shot like it should and has since been replaced. With the experiences that I have had with pre chambered or short chambered barrels, I won't use them at all. so everyone has to decide for themselves which way to go. some are lucky and many are not. Just My Opinion J E CUSTOM [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
"Match" Chamber?
Top