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
Wet Tumbler
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="budlight" data-source="post: 1983526" data-attributes="member: 2939"><p>This is what I understand. looking at the carbon on the <strong>outside</strong> of the case neck after firing. This is what some other posters said.</p><p></p><p>Tony Boyer's book, The Book of Rifle Accuracy(which I read to learn from), page 149, describes how to read various shapes/forms of carbon deposits on the necks of 3-5 times fired cases to help determine if the case neck is too thick. On page 149, figure "1" shows a carbon ring all around the entire case neck (about one-third of the way down from the case mouth to the case shoulder-neck junction) which Tony indicates means the case neck is too thick (has not been turned enough). On this same page, figure "2" shows a drawing of a case showing carbon coming down from the case mouth to the case shoulder-neck junction on only part of the case (not all around the circumference of the case); I am not sure what Tony is saying here in this figure "2" - I do not understand what this drawing is trying to show and tell us. Anyone know?</p><p></p><p>Also, this section of the book addresses such carbon deposits only as a way to determine if the neck is too thick. </p><p></p><p>What I believe Tony is referring to in his book is a sine wave looking carbon line on the neck of the brass. What that shows is that you have enough clearance between the neck and the chamber. What the sine wave shows us is that some of the gases escape into the chamber before the neck actually expands completely, sealing the chamber. This proves that you are getting a good bullet release.</p><p></p><p>I would agree it should be applicable to any cartridge.</p><p>In my experience with a ppc with a 262 neck I started out looking for .001 total clearance. I thought the closer the fir the better and a lot of guys are successful with that approach. With my cases fitted this way the carbon ring was a solid line all the way around the neck just a few thousands back from the edge of the neck.</p><p>After watching Jack Neary talk about brass prep for a ppc. I tried his approach looking for .0015 clearance on both sides of the neck or .003 total clearance. This approach for me has improved my over all group aggs. It also shows the wave type carbon pattern on the necks.</p><p>I would think in a SAMMI chambered barrel and in my experience with a no turn 6br in a sammi chamber there is quite a bit more clearance around the neck than .003 I use in the ppc. My 6 BR shows a solid carbon line around the necks down closer to the shoulder</p></blockquote><p></p>
[QUOTE="budlight, post: 1983526, member: 2939"] This is what I understand. looking at the carbon on the [B]outside[/B] of the case neck after firing. This is what some other posters said. Tony Boyer's book, The Book of Rifle Accuracy(which I read to learn from), page 149, describes how to read various shapes/forms of carbon deposits on the necks of 3-5 times fired cases to help determine if the case neck is too thick. On page 149, figure "1" shows a carbon ring all around the entire case neck (about one-third of the way down from the case mouth to the case shoulder-neck junction) which Tony indicates means the case neck is too thick (has not been turned enough). On this same page, figure "2" shows a drawing of a case showing carbon coming down from the case mouth to the case shoulder-neck junction on only part of the case (not all around the circumference of the case); I am not sure what Tony is saying here in this figure "2" - I do not understand what this drawing is trying to show and tell us. Anyone know? Also, this section of the book addresses such carbon deposits only as a way to determine if the neck is too thick. What I believe Tony is referring to in his book is a sine wave looking carbon line on the neck of the brass. What that shows is that you have enough clearance between the neck and the chamber. What the sine wave shows us is that some of the gases escape into the chamber before the neck actually expands completely, sealing the chamber. This proves that you are getting a good bullet release. I would agree it should be applicable to any cartridge. In my experience with a ppc with a 262 neck I started out looking for .001 total clearance. I thought the closer the fir the better and a lot of guys are successful with that approach. With my cases fitted this way the carbon ring was a solid line all the way around the neck just a few thousands back from the edge of the neck. After watching Jack Neary talk about brass prep for a ppc. I tried his approach looking for .0015 clearance on both sides of the neck or .003 total clearance. This approach for me has improved my over all group aggs. It also shows the wave type carbon pattern on the necks. I would think in a SAMMI chambered barrel and in my experience with a no turn 6br in a sammi chamber there is quite a bit more clearance around the neck than .003 I use in the ppc. My 6 BR shows a solid carbon line around the necks down closer to the shoulder [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Wet Tumbler
Top