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
Confused: Brass/headspace question
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: 2267867" data-attributes="member: 10755"><p>If you have a discrepency in case to shoulder length on once fired brass, that tells me that some was shot with a milder load and have not fully expanded to the chamber. Not uncommon on factory loads.</p><p>As mentioned above, it may take 3 or more firings to get a case to fully fill the chamber.</p><p>An Ackley is also going to alter in headspace due to the nature of the 40° shoulder. It can take quite a few firings to fully form sharp corners which will appear differently on the comparator.</p><p>My 22-250AI Lapua brass is still rounded on the shoulder after 4 firings and I only just size the neck essentially in a Forster BR FL die with honed neck and bump with a body die when required. This particular rifle is my mid range F-class gun for 300-600 matches. It has a 1-7" twist 30" 1.250" straight barrel running 77g Nosler CC's.</p><p>The brass is stable and bump worthy only after 5 firings.</p><p>The same brass (Lapua) used in my standard 22-250 is stable by the third sizing and in both cases they are annealed after each firing. This is just to show you that shoulder angle halts expansion as it gets steeper in angle. I see this on quite a few improved cases, not just the AI version.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2267867, member: 10755"] If you have a discrepency in case to shoulder length on once fired brass, that tells me that some was shot with a milder load and have not fully expanded to the chamber. Not uncommon on factory loads. As mentioned above, it may take 3 or more firings to get a case to fully fill the chamber. An Ackley is also going to alter in headspace due to the nature of the 40° shoulder. It can take quite a few firings to fully form sharp corners which will appear differently on the comparator. My 22-250AI Lapua brass is still rounded on the shoulder after 4 firings and I only just size the neck essentially in a Forster BR FL die with honed neck and bump with a body die when required. This particular rifle is my mid range F-class gun for 300-600 matches. It has a 1-7” twist 30” 1.250” straight barrel running 77g Nosler CC’s. The brass is stable and bump worthy only after 5 firings. The same brass (Lapua) used in my standard 22-250 is stable by the third sizing and in both cases they are annealed after each firing. This is just to show you that shoulder angle halts expansion as it gets steeper in angle. I see this on quite a few improved cases, not just the AI version. Cheers. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Confused: Brass/headspace question
Top