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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
christensen arms ridgeline, I need help.
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<blockquote data-quote="PP guns" data-source="post: 2628656" data-attributes="member: 112232"><p>It's the barrel..I think Christensen had a bad batch of .30 cal barrels. I've already rebarreled 4 brand new rifles for customers and all were.300 win mags. I used to work at a custom barrel shot so I did some investigating and 2 of the take off barrels were measured. Problems were the following -</p><p></p><p>-tight bore (.3000) is the ideal measurement for 30 cals plus or minus a couple tenths. The ones I measured were .2994-.2995". Which isn't terrible but when paired with the next problem it causes problems.</p><p></p><p>-large groove diameter. Again ideal is .3080". The one I inspected was .3095". When I worked at the barrel shop we literally threw away anything over .3085".</p><p></p><p>-crap steel... They are either using really cheap steel or not heat treating to relieve stress properly. I know this because when I gauge pinned the barrels at the muzzle the bore grew a couple tenths (.0002) where the thread tenon on the muzzle was. So basically the bullet is going through the barrel and then hits a loose spot in the muzzle. Exactly the opposite of what you want.</p><p></p><p>There it is. It's not ammo, stocks, bases or rings. These 4 guns shot between 1.5-8moa on the bench. After rebarreling they were sub 1/2" moa. All I changed was the barrel and improved the bedding.</p></blockquote><p></p>
[QUOTE="PP guns, post: 2628656, member: 112232"] It's the barrel..I think Christensen had a bad batch of .30 cal barrels. I've already rebarreled 4 brand new rifles for customers and all were.300 win mags. I used to work at a custom barrel shot so I did some investigating and 2 of the take off barrels were measured. Problems were the following - -tight bore (.3000) is the ideal measurement for 30 cals plus or minus a couple tenths. The ones I measured were .2994-.2995". Which isn't terrible but when paired with the next problem it causes problems. -large groove diameter. Again ideal is .3080". The one I inspected was .3095". When I worked at the barrel shop we literally threw away anything over .3085". -crap steel... They are either using really cheap steel or not heat treating to relieve stress properly. I know this because when I gauge pinned the barrels at the muzzle the bore grew a couple tenths (.0002) where the thread tenon on the muzzle was. So basically the bullet is going through the barrel and then hits a loose spot in the muzzle. Exactly the opposite of what you want. There it is. It's not ammo, stocks, bases or rings. These 4 guns shot between 1.5-8moa on the bench. After rebarreling they were sub 1/2" moa. All I changed was the barrel and improved the bedding. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
christensen arms ridgeline, I need help.
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