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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New GSC 338 LRH bullets.
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<blockquote data-quote="BryanLitz" data-source="post: 1046945" data-attributes="member: 7848"><p>Tim,</p><p></p><p>It's good that you've had a positive experience with these bullets. It is very nice when a bullet maker can offer flexibility; this is one aspect of machined bullets that conventional cup and core bullets cannot match.</p><p></p><p>I've got some questions on your experiences. You stated:</p><p></p><p></p><p></p><p>My question is; what kind of scale were you using to measure bullet weights to 0.001 grain? Most digital scales can resolve within 0.1 grains, some high end ones can get to within 0.02, and I've even seen some resolve to 0.01 grains. But outside of a laboratory environment, I've never heard of scales that can resolve weight to 0.001 grains.</p><p></p><p>Another statement that piqued my interest:</p><p></p><p></p><p>A 6.8 SPC magazine length 99 grain 270 caliber bullet that's supersonic to 1000 yards in a 18" barrel is hard to believe.</p><p></p><p>Even with a G7 BC of .2 (which would require a form factor of 0.88, which is better than nearly any bullet) and a MV of 2800 fps (very optimistic for an 18" barrel 6.8 SPC), the supersonic range is less than 900 yards.</p><p></p><p>The only way I could see this round making 1000 yards supersonic is at very high altitude.</p><p></p><p>It would be interesting if you could locate your records on this bullets BC and MV from the mag length 18" SPC, as well as the altitude of the test. Also, how did you determine the bullet was supersonic at 1000?</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1046945, member: 7848"] Tim, It's good that you've had a positive experience with these bullets. It is very nice when a bullet maker can offer flexibility; this is one aspect of machined bullets that conventional cup and core bullets cannot match. I've got some questions on your experiences. You stated: My question is; what kind of scale were you using to measure bullet weights to 0.001 grain? Most digital scales can resolve within 0.1 grains, some high end ones can get to within 0.02, and I've even seen some resolve to 0.01 grains. But outside of a laboratory environment, I've never heard of scales that can resolve weight to 0.001 grains. Another statement that piqued my interest: A 6.8 SPC magazine length 99 grain 270 caliber bullet that's supersonic to 1000 yards in a 18" barrel is hard to believe. Even with a G7 BC of .2 (which would require a form factor of 0.88, which is better than nearly any bullet) and a MV of 2800 fps (very optimistic for an 18" barrel 6.8 SPC), the supersonic range is less than 900 yards. The only way I could see this round making 1000 yards supersonic is at very high altitude. It would be interesting if you could locate your records on this bullets BC and MV from the mag length 18" SPC, as well as the altitude of the test. Also, how did you determine the bullet was supersonic at 1000? -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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New GSC 338 LRH bullets.
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