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
308 winchester brass life
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: 1139887" data-attributes="member: 5302"><p>My observations contradict SidecarFlip's comments. </p><p></p><p>Years ago, I decided to measure my 6 RCBS .308 Win standard full length sizing dies headspace. Yes, die headspace. </p><p></p><p>Used a GO chamber headspace gauge (1.630") and caliper along with a standard shell holder (.125" height above flat). With the GO gauge in the die and shell holder slipped onto the gauge rim, caliper measured .005" more from die top to shell holder bottom than without that gauge in the die. </p><p></p><p>Therefore, all 6 die's headspace measured 1.625". </p><p></p><p>SAAMI minimum .308 Win case headspace is 1.627". </p><p></p><p>All 6 dies set to stop against the shell holder size fired cases to have 1.626" to 1.627" headspace depending on the case and lubricity it has when sizing down.</p><p></p><p>Which to me means RCBS "chambered" those dies to set fired case shoulders back to approximate SAAMI specs for case headspace when the die was set to be hard against the shell holder flat at the top (cam over) point of the press operation. All fired cases have their shoulders bumped back with any one of those set for cam over press use. </p><p></p><p>Several other RCBS full length sizing dies for other rimless bottleneck cartridges had headspace about .005" less than their GO headspace gauge spec.</p><p></p><p>Called RCBS to ask about it. The said that's how all their full length sizing dies for rimless bottleneck cartridges were made. Same for belted ones.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1139887, member: 5302"] My observations contradict SidecarFlip's comments. Years ago, I decided to measure my 6 RCBS .308 Win standard full length sizing dies headspace. Yes, die headspace. Used a GO chamber headspace gauge (1.630") and caliper along with a standard shell holder (.125" height above flat). With the GO gauge in the die and shell holder slipped onto the gauge rim, caliper measured .005" more from die top to shell holder bottom than without that gauge in the die. Therefore, all 6 die's headspace measured 1.625". SAAMI minimum .308 Win case headspace is 1.627". All 6 dies set to stop against the shell holder size fired cases to have 1.626" to 1.627" headspace depending on the case and lubricity it has when sizing down. Which to me means RCBS "chambered" those dies to set fired case shoulders back to approximate SAAMI specs for case headspace when the die was set to be hard against the shell holder flat at the top (cam over) point of the press operation. All fired cases have their shoulders bumped back with any one of those set for cam over press use. Several other RCBS full length sizing dies for other rimless bottleneck cartridges had headspace about .005" less than their GO headspace gauge spec. Called RCBS to ask about it. The said that's how all their full length sizing dies for rimless bottleneck cartridges were made. Same for belted ones. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
308 winchester brass life
Top