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
Case neck thickness measurements
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="Bart B" data-source="post: 678697" data-attributes="member: 5302"><p>JE Custom, I've only measured two chambers for actual neck diameters; a 7.62 NATO Garand with a mil spec chamber whose neck measured .3453 +/- .0002 with my hole micrometer and a Hart barreled bolt gun whose SAAMI spec chamber neck read .3439 +/- .0002" with the same hole mic. Both had Lake City Arsenal mil-spec proof loads (42 gr. IMR4475 under a 172 gr. bullet in LC 65 lot 12638 primed cases) rated at 65,000 CUP fired in them. Loaded round neck diameters were .337" and after firing in both chambers about .341" This is from my notes taken back in 1988 when the test was run. Regular lot 12638 7.62 NATO M80 ball ammo had fired case necks a couple thousandths smaller.</p><p></p><p>All my .308 max load fired cases dropped into their bolt gun chambers from gravity; none stuck part way in. They all had neck diameters smaller than the chamber necks.</p></blockquote><p></p>
[QUOTE="Bart B, post: 678697, member: 5302"] JE Custom, I've only measured two chambers for actual neck diameters; a 7.62 NATO Garand with a mil spec chamber whose neck measured .3453 +/- .0002 with my hole micrometer and a Hart barreled bolt gun whose SAAMI spec chamber neck read .3439 +/- .0002" with the same hole mic. Both had Lake City Arsenal mil-spec proof loads (42 gr. IMR4475 under a 172 gr. bullet in LC 65 lot 12638 primed cases) rated at 65,000 CUP fired in them. Loaded round neck diameters were .337" and after firing in both chambers about .341" This is from my notes taken back in 1988 when the test was run. Regular lot 12638 7.62 NATO M80 ball ammo had fired case necks a couple thousandths smaller. All my .308 max load fired cases dropped into their bolt gun chambers from gravity; none stuck part way in. They all had neck diameters smaller than the chamber necks. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Case neck thickness measurements
Top