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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 x 284 h4821sc 51 gr. 140vdl. velocity?
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<blockquote data-quote="SBruce" data-source="post: 700980" data-attributes="member: 21068"><p>I noticed the same thing when reading up on the cartridge prior to buying mine.</p><p> </p><p>None of my manuals agree on the maximum powder charge. They vary by about 5 grains. So, I went off the 284 Winchester data with the same bullet weight, and the results were much more comparable. Most of my manuals don't even list the 6.5-284 cartidge. Alot of the guys that are shooting competition are shooting more powder than the books say they should.</p><p> </p><p>I am shooting way more powder than the books say to get 2975'/sec with the same load out of a 26" tube..............54.5 grns H4831sc. Didn't start seeing any ejector flow until 56 grns powder! 54.5 was the best group of anything from 51 to 56 grns, and I can neck size the brass.......it's not so hot that it has to be FL sized every firing. Differences in bores and chambers and throats apparently.??? </p><p> </p><p>3000'/sec is expected out of this cartridge with 26" barrels or longer as far as I've been able to research. When I watched David Tubb shoot it at a mile (on video) he mentioned he was getting 3000' / sec. The Hodgdons data for the 140 says max is only 2700 something. ??</p></blockquote><p></p>
[QUOTE="SBruce, post: 700980, member: 21068"] I noticed the same thing when reading up on the cartridge prior to buying mine. None of my manuals agree on the maximum powder charge. They vary by about 5 grains. So, I went off the 284 Winchester data with the same bullet weight, and the results were much more comparable. Most of my manuals don't even list the 6.5-284 cartidge. Alot of the guys that are shooting competition are shooting more powder than the books say they should. I am shooting way more powder than the books say to get 2975'/sec with the same load out of a 26" tube..............54.5 grns H4831sc. Didn't start seeing any ejector flow until 56 grns powder! 54.5 was the best group of anything from 51 to 56 grns, and I can neck size the brass.......it's not so hot that it has to be FL sized every firing. Differences in bores and chambers and throats apparently.??? 3000'/sec is expected out of this cartridge with 26" barrels or longer as far as I've been able to research. When I watched David Tubb shoot it at a mile (on video) he mentioned he was getting 3000' / sec. The Hodgdons data for the 140 says max is only 2700 something. ?? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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6.5 x 284 h4821sc 51 gr. 140vdl. velocity?
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