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
Advice needed
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="Fiftydriver" data-source="post: 35896" data-attributes="member: 10"><p>Jaeger476,</p><p></p><p>This is a tough one, When I do all of my recrowning, I generally take off about 0.050" off the muzzle or enough to clean up any old crown contour there is.</p><p></p><p>I much prefer an 11 degree crown which a add a couple things of my own.</p><p></p><p>Did PGW give any explanation for the excessive barrel amputation?</p><p></p><p>I have had to do this on factory barrels that were belled out but with your rifle shooting in the 1/3 moa range this was certainly not the case. Sounds like someone made a mistake and had to cut off more barre to fix it. Pretty hard to screw up a recrowning job though.</p><p></p><p>If you came to my shop with this problem I would tell you to develope the load until you get the velocity to where it was before the problem, save 15-20 fps for the shorter barrel.</p><p></p><p>THis will give you nearly the same pressure as before which your rifle obviously liked.</p><p></p><p>Then I would start with your bullets seated where they are now and then test the load seated 0.005" less, then 0.005" less and 0.005" shorter still.</p><p></p><p>BAsically, you want to keep the same pressure and velocity but you may have to find a new sweet spot for your load length as shortening your barrel by 3/4" seems to have effected the harmonics of your barrel. </p><p></p><p>It may suprise you hwo your rifle will shoot with shorter lengths.</p><p></p><p>If this does not work, I would be a little concerned about them lapping the bore. If done correctly, this really does not take any real amount of metal off the bore, just polishes what is there.</p><p></p><p>IF done incorrectly, you can get buldges in your bore or actually over sized bores which will destroy your accuracy, especially if your bore is tighter at the throat then the muzzle end.</p><p></p><p>This can be a real pain to figure out unless you make a muzzle case and measure your muzzle diameter.</p><p></p><p>You can also take a lead bullet, pure lead is best that is close to .308 and drive it down your barrel from the chamber end.</p><p></p><p>You will actually be able to feel any variations in bore diameter as you push the bullet down the length of the barrel. In the loose spots it will be much easier to move the slug.</p><p></p><p>This is really to bad. A recrowning job should be one of the easiest accuracy enhancing proceedures to do. I only charge $15 to do it in my shop even with using live piloted bushings to match the crown to 0.0002" or less of the axis of the bore.</p><p></p><p>There is just no reason to screw it up like this.</p><p></p><p>This is a place to start, after that, may need a rebarrel job if the lapping washed your bore out to much.</p><p></p><p>Not good news but its better to know then wonder!!</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 35896, member: 10"] Jaeger476, This is a tough one, When I do all of my recrowning, I generally take off about 0.050" off the muzzle or enough to clean up any old crown contour there is. I much prefer an 11 degree crown which a add a couple things of my own. Did PGW give any explanation for the excessive barrel amputation? I have had to do this on factory barrels that were belled out but with your rifle shooting in the 1/3 moa range this was certainly not the case. Sounds like someone made a mistake and had to cut off more barre to fix it. Pretty hard to screw up a recrowning job though. If you came to my shop with this problem I would tell you to develope the load until you get the velocity to where it was before the problem, save 15-20 fps for the shorter barrel. THis will give you nearly the same pressure as before which your rifle obviously liked. Then I would start with your bullets seated where they are now and then test the load seated 0.005" less, then 0.005" less and 0.005" shorter still. BAsically, you want to keep the same pressure and velocity but you may have to find a new sweet spot for your load length as shortening your barrel by 3/4" seems to have effected the harmonics of your barrel. It may suprise you hwo your rifle will shoot with shorter lengths. If this does not work, I would be a little concerned about them lapping the bore. If done correctly, this really does not take any real amount of metal off the bore, just polishes what is there. IF done incorrectly, you can get buldges in your bore or actually over sized bores which will destroy your accuracy, especially if your bore is tighter at the throat then the muzzle end. This can be a real pain to figure out unless you make a muzzle case and measure your muzzle diameter. You can also take a lead bullet, pure lead is best that is close to .308 and drive it down your barrel from the chamber end. You will actually be able to feel any variations in bore diameter as you push the bullet down the length of the barrel. In the loose spots it will be much easier to move the slug. This is really to bad. A recrowning job should be one of the easiest accuracy enhancing proceedures to do. I only charge $15 to do it in my shop even with using live piloted bushings to match the crown to 0.0002" or less of the axis of the bore. There is just no reason to screw it up like this. This is a place to start, after that, may need a rebarrel job if the lapping washed your bore out to much. Not good news but its better to know then wonder!! Good Shooting!! Kirby Allen(50) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advice needed
Top