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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Winchester bore and cast bullets leading
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<blockquote data-quote="Deleted member 118572" data-source="post: 2193513"><p>Funny how Harry Pope and all those guys who "knew nothing" shot SOFT lead bullets at the same velocities as this 45-90 and had no leading issues.</p><p></p><p>OP, you may wish to join a cast bullet site and ask some folks who know.</p><p></p><p>castboolits.com</p><p>[URL unfurl="true"]https://forum.castbulletassoc.org/[/URL]</p><p></p><p>Not that I do, but this is 45 caliber, shots pure lead 450 gr with 2% tin lubed with SPG at 1800 fps and never leads.</p><p></p><p>"Dusted" both sides of 5x6 bull at 200 yards. He died.</p><p></p><p>From a real "expert":</p><p></p><p><strong><em>"Streaks, following the rifling.</em></strong> If the leading is seen to "follow the rifling" (i.e. streaks that twist down the barrel in close association with the rifling grooves), then this is a tell-tale sign that the bullet is cast too hard and failing to obturate. Obturation is usually thought of as a plastic deformation that swells the bullet's diameter, but it also leads to a back-filling of engraving defects along the trailing edge of the land. If the bullet is cast too hard to obturate, these defects will not be back-filled and gas-cutting will take place through these voids, following the trailing edge of that particular land. This effect can be mitigated somewhat through judicious choice of lube, but lube by itself can only do so much. <strong>The real solution here is to go with a softer bullet <em>and </em>a better lube."</strong></p><p><strong></strong></p><p><strong>[ATTACH=full]273171[/ATTACH]</strong></p><p><strong>[ATTACH=full]273172[/ATTACH]</strong></p><p><strong></strong></p><p><strong>Gas checks exist to prevent gas cutting of the bullet to prevent leading NOT to scrape lead out of the barrel.</strong></p><p><strong></strong></p><p><strong></strong></p></blockquote><p></p>
[QUOTE="Deleted member 118572, post: 2193513"] Funny how Harry Pope and all those guys who "knew nothing" shot SOFT lead bullets at the same velocities as this 45-90 and had no leading issues. OP, you may wish to join a cast bullet site and ask some folks who know. castboolits.com [URL unfurl="true"]https://forum.castbulletassoc.org/[/URL] Not that I do, but this is 45 caliber, shots pure lead 450 gr with 2% tin lubed with SPG at 1800 fps and never leads. "Dusted" both sides of 5x6 bull at 200 yards. He died. From a real "expert": [B][I]"Streaks, following the rifling.[/I][/B] If the leading is seen to "follow the rifling" (i.e. streaks that twist down the barrel in close association with the rifling grooves), then this is a tell-tale sign that the bullet is cast too hard and failing to obturate. Obturation is usually thought of as a plastic deformation that swells the bullet's diameter, but it also leads to a back-filling of engraving defects along the trailing edge of the land. If the bullet is cast too hard to obturate, these defects will not be back-filled and gas-cutting will take place through these voids, following the trailing edge of that particular land. This effect can be mitigated somewhat through judicious choice of lube, but lube by itself can only do so much. [B]The real solution here is to go with a softer bullet [I]and [/I]a better lube." [ATTACH type="full"]273171[/ATTACH] [ATTACH type="full"]273172[/ATTACH] Gas checks exist to prevent gas cutting of the bullet to prevent leading NOT to scrape lead out of the barrel. [/B] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Winchester bore and cast bullets leading
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