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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
284 Thor Progress
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<blockquote data-quote="NZ Longranger" data-source="post: 494931" data-attributes="member: 14"><p>You're quite right Jim. We always see a pressure climb usually around 50 rounds down the tube. Its due to the throat roughening or thickening slightly. You usually have to drop one grain with the big guns at this point. So long as you're aware of this, you can work up your load while you're breaking the barrel in then just keep an eye on velocities and pressure from 40 rounds onwards till you have to drop the powder charge. What velocity shoots accurately before the change mostly works afterwards, just have to drop a grain to maintain the same velocity!</p><p>Greg</p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 494931, member: 14"] You're quite right Jim. We always see a pressure climb usually around 50 rounds down the tube. Its due to the throat roughening or thickening slightly. You usually have to drop one grain with the big guns at this point. So long as you're aware of this, you can work up your load while you're breaking the barrel in then just keep an eye on velocities and pressure from 40 rounds onwards till you have to drop the powder charge. What velocity shoots accurately before the change mostly works afterwards, just have to drop a grain to maintain the same velocity! Greg [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
284 Thor Progress
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