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<blockquote data-quote="J E Custom" data-source="post: 1585702" data-attributes="member: 2736"><p>I was referencing the 6.8 SPC because it was designed as a replacement for the 556 and not knocking the 556. I realize</p><p>that a cartridge can perform differently with/in different rifles</p><p></p><p>My 16" barreled 6.8 would not reach the factory velocities listed (2800 ft/sec) until I switched to a 24'' barrel. The designer of the round (Remington) sell loaded ammo that will do the listed 2800 ft/sec with just over 2000 ft/lbs. (2002 ft/lbs of energy) <a href="https://www.midwayusa.com/product/1601258141/remington-premier-match-ammunition-68mm-remington-spc-115-grain-sierra-matchking-hollow-point" target="_blank">https://www.midwayusa.com/product/1601258141/remington-premier-match-ammunition-68mm-remington-spc-115-grain-sierra-matchking-hollow-point</a></p><p></p><p>The best I ever got from the 556 was 3400 ft/sec with a 53 grain bullet for just over 1400 ft/lbs energy. So comparing the best I could get from both the 6.8 is over 600 ft/lbs better, and on game you can definitely see the difference.</p><p></p><p>I totally agree that they should have used the 6.5 bullet and in fact, I had considered designing a wildcat with the 5.5 bullets and the 6.8 cases but the difference was almost nil. so it would not be worth it.</p><p></p><p>One other possibility that I was surprised they didn't look at was the 7 TCU (A 223/556 necked up to 7mm) this round was very popular with ISHMA shooters.</p><p></p><p>The 762 x 39 ammo is almost all the same because of the weapons made for it and the 6.8 will out do it so to me it is a winner. there are other cartridges that are others favorites as it should be. but my belief is that it would be a good choice to upgrade the 556 and keep the same format of a rifle.</p><p></p><p>I am also one of those guys that think that the M-14 was great and should still be in service or at least some variant.</p><p></p><p>Good discussion !!!! keep it going.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1585702, member: 2736"] I was referencing the 6.8 SPC because it was designed as a replacement for the 556 and not knocking the 556. I realize that a cartridge can perform differently with/in different rifles My 16" barreled 6.8 would not reach the factory velocities listed (2800 ft/sec) until I switched to a 24'' barrel. The designer of the round (Remington) sell loaded ammo that will do the listed 2800 ft/sec with just over 2000 ft/lbs. (2002 ft/lbs of energy) [URL]https://www.midwayusa.com/product/1601258141/remington-premier-match-ammunition-68mm-remington-spc-115-grain-sierra-matchking-hollow-point[/URL] The best I ever got from the 556 was 3400 ft/sec with a 53 grain bullet for just over 1400 ft/lbs energy. So comparing the best I could get from both the 6.8 is over 600 ft/lbs better, and on game you can definitely see the difference. I totally agree that they should have used the 6.5 bullet and in fact, I had considered designing a wildcat with the 5.5 bullets and the 6.8 cases but the difference was almost nil. so it would not be worth it. One other possibility that I was surprised they didn't look at was the 7 TCU (A 223/556 necked up to 7mm) this round was very popular with ISHMA shooters. The 762 x 39 ammo is almost all the same because of the weapons made for it and the 6.8 will out do it so to me it is a winner. there are other cartridges that are others favorites as it should be. but my belief is that it would be a good choice to upgrade the 556 and keep the same format of a rifle. I am also one of those guys that think that the M-14 was great and should still be in service or at least some variant. Good discussion !!!! keep it going. J E CUSTOM [/QUOTE]
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