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Rifles, Reloading, Optics, Equipment
Reloading
Quick question on pulling bullets
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<blockquote data-quote="Pdvdh" data-source="post: 402029" data-attributes="member: 4191"><p>My experiment was with one case only. Because I obtained the same result as I have over the past 5 years doing basically the same thing. With the exception that I don't normally measure inner case neck ID as a tool to determine whether or not I should resize the case neck after pulling a bullet - prior to re-seating it.</p><p>I had two loaded cartridges with excessive powder charges, based on the result of firing one similarly loaded one last weekend.</p><p></p><p>30.06 Lapua brass necked down and fire-formed to .280 RCBS Impproved. Cases are uniformly outside neck-turned with a K&M Services outside neck turning tool.</p><p>Bullet is .284 - 160 gr Nosler Accubond.</p><p></p><p>I use a 0.311" Redding Neck Bushing to size the necks on this cartridge, and I measured the inside neck diameter (ID) of two of my prepped, but unprimed, cases at ~0.2812", best as I could with a 0.001" Mitutoyo dial caliper.</p><p></p><p>I pulled the bullet on one of these two loaded cartridges. Measured the inside neck diameter at ~0.2822", again best as I could determine. Obviously estimating the location of the needle between 0.282 and 0.283. I noted the force required on my press handle.</p><p></p><p>Reseated the bullet in the same case noting the force on the RCBS press handle to seat the bullet to the same depth within 0.001" from case head to ogive. Pulled the bullet and noted slightly reduced force to pull the bullet the second time compared to the first. The pulling force was clearly less the first 1/2 of the way and then pretty similar for the last 1/2 of the bullet removal throw of the press handle. I re-measured the ID of the case neck and estimated it to be ~0.0001 to 0.0002" larger than after the first pulling of the bullet.</p><p></p><p>Reseated the bullet, pulled it. Less force to seat the bullet this time and less force to pull it.</p><p></p><p>Reseated the bullet a third time and after some initial resistance, the press handle slipped through my fingers and the weight of the handle alone seated the bullet to total depth. Surprised me, as this would not have happened either of the first two times I seated the bullet. The force on the press handle was very notably less to seat the bullet this third time than either of the two prior times. Pulled the bullet and the force to pull was definitely less than that required to pull the bullet the initial time. I remeasured the ID of the case neck after the third pulling of the bullet at ~0.2828 to 0.2829". </p><p></p><p>I noted that this case had previously been fired following ultrasonic cleaning, so the inner case neck was already carbon fouled. The bullet had been seated in this cartridge case for 2 weeks. Since the inner case neck was carbon fouled, I doubt there was significant chemical bonding of the bullet to brass case neck over that two-week time period.</p><p></p><p>I don't normally measure the case neck ID for comparison after pulling bullets. Only did so this time since you had done so. I decide whether or not to resize the case neck based on the my feel of the reduced force on the press handle required to re-seat and re-pull a bullet. The neck on this case will be resized with the 0.311" neck bushing, prior to recharging with 1/2 less grain of powder and seating the bullet for final firing.</p><p></p><p>Don't know what to tell you. The thinner the case neck walls - the more likely your argument holds water. The thicker the case neck walls - the less likely your theory holds water. That's my opinion. Also, I don't know what caliber bullet you're loading. The large the caliber, the greater the surface area contact between the bullet and the case neck for equivalent bullet seating depths. This could affect the ability to feel the difference in force on the press handle? It will have some impact, but not sure in which direction. I don't fine tune and fuss much with the reloading any rifle cartridges less than 7mm caliber. Mostly 7mm, .308, and .338s. I own other calibers, but don't fine tune loads for those rifles, involving pulling bullets during the load development and refinement process.</p><p></p><p>Our experiments reached different conclusions. My result was the same as I've previously experienced with 7mm and .308 caliber cartridges. I am certain that my inner case neck ID grew over the four bullet pulls and three bullet seatings. By a minimum of 0.0003" even when I round my estimated neck ID measurements in the direction to minimize the difference between the first and last measurement.</p><p></p><p>Pretty sure we've reached differing opinions on this topic also. I have no grief over that, and hope the same for you.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 402029, member: 4191"] My experiment was with one case only. Because I obtained the same result as I have over the past 5 years doing basically the same thing. With the exception that I don't normally measure inner case neck ID as a tool to determine whether or not I should resize the case neck after pulling a bullet - prior to re-seating it. I had two loaded cartridges with excessive powder charges, based on the result of firing one similarly loaded one last weekend. 30.06 Lapua brass necked down and fire-formed to .280 RCBS Impproved. Cases are uniformly outside neck-turned with a K&M Services outside neck turning tool. Bullet is .284 - 160 gr Nosler Accubond. I use a 0.311" Redding Neck Bushing to size the necks on this cartridge, and I measured the inside neck diameter (ID) of two of my prepped, but unprimed, cases at ~0.2812", best as I could with a 0.001" Mitutoyo dial caliper. I pulled the bullet on one of these two loaded cartridges. Measured the inside neck diameter at ~0.2822", again best as I could determine. Obviously estimating the location of the needle between 0.282 and 0.283. I noted the force required on my press handle. Reseated the bullet in the same case noting the force on the RCBS press handle to seat the bullet to the same depth within 0.001" from case head to ogive. Pulled the bullet and noted slightly reduced force to pull the bullet the second time compared to the first. The pulling force was clearly less the first 1/2 of the way and then pretty similar for the last 1/2 of the bullet removal throw of the press handle. I re-measured the ID of the case neck and estimated it to be ~0.0001 to 0.0002" larger than after the first pulling of the bullet. Reseated the bullet, pulled it. Less force to seat the bullet this time and less force to pull it. Reseated the bullet a third time and after some initial resistance, the press handle slipped through my fingers and the weight of the handle alone seated the bullet to total depth. Surprised me, as this would not have happened either of the first two times I seated the bullet. The force on the press handle was very notably less to seat the bullet this third time than either of the two prior times. Pulled the bullet and the force to pull was definitely less than that required to pull the bullet the initial time. I remeasured the ID of the case neck after the third pulling of the bullet at ~0.2828 to 0.2829". I noted that this case had previously been fired following ultrasonic cleaning, so the inner case neck was already carbon fouled. The bullet had been seated in this cartridge case for 2 weeks. Since the inner case neck was carbon fouled, I doubt there was significant chemical bonding of the bullet to brass case neck over that two-week time period. I don't normally measure the case neck ID for comparison after pulling bullets. Only did so this time since you had done so. I decide whether or not to resize the case neck based on the my feel of the reduced force on the press handle required to re-seat and re-pull a bullet. The neck on this case will be resized with the 0.311" neck bushing, prior to recharging with 1/2 less grain of powder and seating the bullet for final firing. Don't know what to tell you. The thinner the case neck walls - the more likely your argument holds water. The thicker the case neck walls - the less likely your theory holds water. That's my opinion. Also, I don't know what caliber bullet you're loading. The large the caliber, the greater the surface area contact between the bullet and the case neck for equivalent bullet seating depths. This could affect the ability to feel the difference in force on the press handle? It will have some impact, but not sure in which direction. I don't fine tune and fuss much with the reloading any rifle cartridges less than 7mm caliber. Mostly 7mm, .308, and .338s. I own other calibers, but don't fine tune loads for those rifles, involving pulling bullets during the load development and refinement process. Our experiments reached different conclusions. My result was the same as I've previously experienced with 7mm and .308 caliber cartridges. I am certain that my inner case neck ID grew over the four bullet pulls and three bullet seatings. By a minimum of 0.0003" even when I round my estimated neck ID measurements in the direction to minimize the difference between the first and last measurement. Pretty sure we've reached differing opinions on this topic also. I have no grief over that, and hope the same for you. [/QUOTE]
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