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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Musings on barrel life...
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<blockquote data-quote="royinidaho" data-source="post: 193864" data-attributes="member: 2011"><p>I can't believe I read the whole thing?!???</p><p></p><p>It's been a hundert years since I seen those metallurgy terms. I was hoping to see "closed packed hexagonal" in there somewhere. That was my favorite.</p><p></p><p>That was a heck of a good read.</p><p></p><p>Here's my experience.</p><p></p><p>I gave up Remington 40X and Hart Actioned/Hart Barrels and the whole bench rest thing when HK brought out the PSG-1 with the polygonal rifling which would out shoot anything that I had. And that out of a semi-auto.</p><p></p><p>I shoot a fairly high intensity cartridge with a 3 groove Lilja with, I think, a 1-7 twist. It started dusting lighter jacked, long bearing surfaced bullets at about 400 rounds. I'm told that about 50% of the barrels of this design do the same thing. Its definitely hard on the bullets.</p><p></p><p>The 5R barrel when rifled exactly right seems to be less hard on bullets.</p><p></p><p>I'm thinking my next barrel will be the Schneider polygonal in a larger slower twist caliber.</p><p></p><p>I did some experimenting with Frontal Ignition, igniting the powder at the bullet base, but it appeared that the temperatures increased mostly just ahead of the chamber thing migrated down the barrel. Concentration the heat at the throat seemed to be the opposite of what I was seeking. However, Extreme Velocity Spread and Standard Deviation and accuracy were improved. Plus recoil was noticeably less.</p><p></p><p>The paradigm may have changed with the newer steels. I'd pay extra for the pluses, if they 'really' made a difference.</p><p></p><p>Keep up the research.</p><p></p><p>You post 'em I'll read 'em.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 193864, member: 2011"] I can't believe I read the whole thing?!??? It's been a hundert years since I seen those metallurgy terms. I was hoping to see "closed packed hexagonal" in there somewhere. That was my favorite. That was a heck of a good read. Here's my experience. I gave up Remington 40X and Hart Actioned/Hart Barrels and the whole bench rest thing when HK brought out the PSG-1 with the polygonal rifling which would out shoot anything that I had. And that out of a semi-auto. I shoot a fairly high intensity cartridge with a 3 groove Lilja with, I think, a 1-7 twist. It started dusting lighter jacked, long bearing surfaced bullets at about 400 rounds. I'm told that about 50% of the barrels of this design do the same thing. Its definitely hard on the bullets. The 5R barrel when rifled exactly right seems to be less hard on bullets. I'm thinking my next barrel will be the Schneider polygonal in a larger slower twist caliber. I did some experimenting with Frontal Ignition, igniting the powder at the bullet base, but it appeared that the temperatures increased mostly just ahead of the chamber thing migrated down the barrel. Concentration the heat at the throat seemed to be the opposite of what I was seeking. However, Extreme Velocity Spread and Standard Deviation and accuracy were improved. Plus recoil was noticeably less. The paradigm may have changed with the newer steels. I'd pay extra for the pluses, if they 'really' made a difference. Keep up the research. You post 'em I'll read 'em. [/QUOTE]
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Musings on barrel life...
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