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
Tight neck 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="shortgrass" data-source="post: 1094303" data-attributes="member: 24284"><p>SAAMI specs on most call for .010" clearance. That's alot! Reamer makers might run their reamer bodies on the tight side, but rarely do they run necks tight. It's a safety thing. All ammo, commercially loaded or reloads, must fit into the chamber and be safe. Ammo fired in a chamber without sufficent clearance can give excessive chamber pressures to the point of being dangerous to the shooter, bystanders, and the firearm. I own and use several tight necked reamers per client request. The neck diameter is engraved in the same line as the caliber designation. If your rifle has a tight necked chamber you only need turn necks once. Some factory ammo may or may not chamber. To chamber and fire ammo of unknown neck diameter in a tight neck chamber is an invitation to a potential disaster. Tight neck chambers can be cut a couple of different ways. The neck portion can be incorporated into the reamer in the usual way. Or the reamer can only cut the body and a seperate reamer be used to cut the neck. The first method is the usual way, the neck is cut with the rest of the chamber, not as a sperate operation with a seperate tool. There is another condition known as a "no turn neck". In this condition a lot ( meaning a group) of brass is measured, with bullt seated, for neck diameter. The reamer maker alters the neck of the reamer for clearance to the gunsmiths specs( typically .003" to . 0035",,,, meaning .0015" to .00175" clearance per side. Usually not more than .005" clearance. If you're using more than .005" clearance why bother? It costs on the average $30 to have the neck altered on a reamer). The reloader then only uses this brass or brass with the same dimention for his loads.If the neck of your chamber has these tight of clearances don't roll your ammo in the dirt before trying to chamber it. Many tight necked match chambers have even less clearance. Typically .001"- .00075" (even reamer makers need a tolerance to work within). Tight necks of any kind are not for the novice. It takes a good understanding of the relationship of ammo to chamber before a tight necked chamber is ordered from your gunsmith. I spend considerable time with every client I cut a "custom" chamber for, both before the chamber is cut and after and I still get to remove a stuck, live round from a chamber now and then. Tight necks can enhance accuracy and give more loads per casing provided everything else is correct. They are not for everyone.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1094303, member: 24284"] SAAMI specs on most call for .010" clearance. That's alot! Reamer makers might run their reamer bodies on the tight side, but rarely do they run necks tight. It's a safety thing. All ammo, commercially loaded or reloads, must fit into the chamber and be safe. Ammo fired in a chamber without sufficent clearance can give excessive chamber pressures to the point of being dangerous to the shooter, bystanders, and the firearm. I own and use several tight necked reamers per client request. The neck diameter is engraved in the same line as the caliber designation. If your rifle has a tight necked chamber you only need turn necks once. Some factory ammo may or may not chamber. To chamber and fire ammo of unknown neck diameter in a tight neck chamber is an invitation to a potential disaster. Tight neck chambers can be cut a couple of different ways. The neck portion can be incorporated into the reamer in the usual way. Or the reamer can only cut the body and a seperate reamer be used to cut the neck. The first method is the usual way, the neck is cut with the rest of the chamber, not as a sperate operation with a seperate tool. There is another condition known as a "no turn neck". In this condition a lot ( meaning a group) of brass is measured, with bullt seated, for neck diameter. The reamer maker alters the neck of the reamer for clearance to the gunsmiths specs( typically .003" to . 0035",,,, meaning .0015" to .00175" clearance per side. Usually not more than .005" clearance. If you're using more than .005" clearance why bother? It costs on the average $30 to have the neck altered on a reamer). The reloader then only uses this brass or brass with the same dimention for his loads.If the neck of your chamber has these tight of clearances don't roll your ammo in the dirt before trying to chamber it. Many tight necked match chambers have even less clearance. Typically .001"- .00075" (even reamer makers need a tolerance to work within). Tight necks of any kind are not for the novice. It takes a good understanding of the relationship of ammo to chamber before a tight necked chamber is ordered from your gunsmith. I spend considerable time with every client I cut a "custom" chamber for, both before the chamber is cut and after and I still get to remove a stuck, live round from a chamber now and then. Tight necks can enhance accuracy and give more loads per casing provided everything else is correct. They are not for everyone. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
Top