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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What makes a cartridge accurate?
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<blockquote data-quote="Trickymissfit" data-source="post: 1110537" data-attributes="member: 25383"><p>best place to start in a discussion of an extreme tight grouping cartridge is to read the works of Parker Ackley. Still some more can be learned, but it's a good start. Case volume, and powder burn (nothing to do with burn rates) will make or brake you. You want as much of a complete powder burn as possible. Neck length should be a minimum of 1.25 calibers. Shoulder angle can be all over the place, but there is really only one proven combination. That would be a thirty degree shoulder (in that area), and the longer neck length. The primer can often be important, but the flash hole is just as important. You want an intense stream thru the hole. The longer and hotter the better. Bullets should never be seater with the base extending into the shoulder area.</p><p></p><p>I used to know Ferris Pindell (one of the PPC designers), and once I asked him about the in's and out's of the PPC design. He was a very candid guy, and gave most of the credit to Lou Palmasano (hope I spelled his name right). Ferris said that the 6BR was a better round past 350 yards. The PPC is what most folks think of as the single most accurate round ever developed, but it wasn't according to Ferris. They had another that was better. It was a 6mm as well, but never saw the case in the flesh. Others I know or knew have seen the case, but I was at the bottom of the pecking order I guess. (he knew I had little interest in bench rest shooting anyway).Ferris said that short fat cases were best, but not to an extreme. Otherwise you had the same problem that too long of a case has only in width. Necks are critical, and tension is even more. </p><p></p><p>A lot of Hunters Benchrest shooters design their own cases off the PPC ratios, and just expand them to 30 caliber while holding slightly greater volume than a 30-30. Seems to work well for them. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 1110537, member: 25383"] best place to start in a discussion of an extreme tight grouping cartridge is to read the works of Parker Ackley. Still some more can be learned, but it's a good start. Case volume, and powder burn (nothing to do with burn rates) will make or brake you. You want as much of a complete powder burn as possible. Neck length should be a minimum of 1.25 calibers. Shoulder angle can be all over the place, but there is really only one proven combination. That would be a thirty degree shoulder (in that area), and the longer neck length. The primer can often be important, but the flash hole is just as important. You want an intense stream thru the hole. The longer and hotter the better. Bullets should never be seater with the base extending into the shoulder area. I used to know Ferris Pindell (one of the PPC designers), and once I asked him about the in's and out's of the PPC design. He was a very candid guy, and gave most of the credit to Lou Palmasano (hope I spelled his name right). Ferris said that the 6BR was a better round past 350 yards. The PPC is what most folks think of as the single most accurate round ever developed, but it wasn't according to Ferris. They had another that was better. It was a 6mm as well, but never saw the case in the flesh. Others I know or knew have seen the case, but I was at the bottom of the pecking order I guess. (he knew I had little interest in bench rest shooting anyway).Ferris said that short fat cases were best, but not to an extreme. Otherwise you had the same problem that too long of a case has only in width. Necks are critical, and tension is even more. A lot of Hunters Benchrest shooters design their own cases off the PPC ratios, and just expand them to 30 caliber while holding slightly greater volume than a 30-30. Seems to work well for them. gary [/QUOTE]
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