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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Musings on barrel life...
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<blockquote data-quote="Mikecr" data-source="post: 143875" data-attributes="member: 1521"><p>Great subject and information. </p><p>All I can say is please come up with a plating process to extend barrel life without hurting accuracy. Please do this for us.</p><p></p><p>I have followed this subject as well. I'm now pretty sure that accuracy loss, the point of declaring a barrel whipped, is reached with bore constriction due to carbon impingement/displacement/buildup in the stress cracking(don'y even know what to call it). I think carbon is 'digging in' tenaciously, and eventually raising the surface. This constricts the bullet more at the breach than at the muzzle. And if the bore isn't tightest at the muzzle, forget accuracy. It's gone.</p><p>I think this falls in line with barrel life being extended for a bit through lapping(either firelapping or JB past). It also explains why barrels still 'die' even though the lands have not moved yet(plenty of cooling time between shots).</p><p></p><p>I have used tungsten coating for many years. But I don't keep rifles long, and haven't reached a barrel's end. With coatings like this, and now Boron Nitride, I worry about their affects regarding carbon in the metal surface. For all I know, they might contribute to the problem.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 143875, member: 1521"] Great subject and information. All I can say is please come up with a plating process to extend barrel life without hurting accuracy. Please do this for us. I have followed this subject as well. I'm now pretty sure that accuracy loss, the point of declaring a barrel whipped, is reached with bore constriction due to carbon impingement/displacement/buildup in the stress cracking(don'y even know what to call it). I think carbon is 'digging in' tenaciously, and eventually raising the surface. This constricts the bullet more at the breach than at the muzzle. And if the bore isn't tightest at the muzzle, forget accuracy. It's gone. I think this falls in line with barrel life being extended for a bit through lapping(either firelapping or JB past). It also explains why barrels still 'die' even though the lands have not moved yet(plenty of cooling time between shots). I have used tungsten coating for many years. But I don't keep rifles long, and haven't reached a barrel's end. With coatings like this, and now Boron Nitride, I worry about their affects regarding carbon in the metal surface. For all I know, they might contribute to the problem. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Musings on barrel life...
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