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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Round count to settle barrel down
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<blockquote data-quote="MagnumManiac" data-source="post: 2258412" data-attributes="member: 10755"><p>I had my last 3 Bartlein barrels all speed up after 80 rounds, and it was progressive over about 20 or so shots.</p><p>My old Hart barrels didn't speed up until 120 or so shots.</p><p>My custom 338-416 Rigby Improved barrel, CM 32" long 9" twist is hand lapped and it only shoots HBN coated bullets and it sped up at 90 shots, like someone turned on a light switch.</p><p>It also took a lot of burnishing with the HBN before it would even settle on a powder node, it was a roller coaster journey for those 90 rounds.</p><p>Barrel steel hardness, how the barrel is stress relieved and what machining tools are used all affect how it burnishes.</p><p>My latest barrel is being cryo'd, have tried nitrided and melonite in the past. Nitriding is thin and wears off in my experience after only a couple thousand rounds.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2258412, member: 10755"] I had my last 3 Bartlein barrels all speed up after 80 rounds, and it was progressive over about 20 or so shots. My old Hart barrels didn’t speed up until 120 or so shots. My custom 338-416 Rigby Improved barrel, CM 32” long 9” twist is hand lapped and it only shoots HBN coated bullets and it sped up at 90 shots, like someone turned on a light switch. It also took a lot of burnishing with the HBN before it would even settle on a powder node, it was a roller coaster journey for those 90 rounds. Barrel steel hardness, how the barrel is stress relieved and what machining tools are used all affect how it burnishes. My latest barrel is being cryo’d, have tried nitrided and melonite in the past. Nitriding is thin and wears off in my experience after only a couple thousand rounds. Cheers. [/QUOTE]
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Round count to settle barrel down
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