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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Throat Burner
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<blockquote data-quote="Trickymissfit" data-source="post: 954854" data-attributes="member: 25383"><p>agree with you yes, but also disagree with you somewhat. Heat is what erodes the throat, and not basic pressures by themselves. Low pressure does tend to avoid the issue of blasting the throat and barrel with unburnt powder, or hot burning gases with intensity. The basic shape of the case and neck also have a good part of this equation. Forty degree and beyond shoulders with at least a caliber and a quarter neck length seem to give far better throat lives. The 6.5/284 has a 35 degree shoulder, and this is a big plus for that particular cartridge. Yet the neck length is barely adequate. Had it been another .06" to .093", I think we're looking at a spectacular cartridge. 3200fps with a 140 grain bullet and H1000 powder powders seems like 75K psi pressures to me. Maybe I'm wrong, but a look in several manuals doesn't even come close to that. The Hornaday manual is 500fps slower, but also can see that load to be a little light. A heavy load of Magpro in that case and using the 140 grain bullet will get you a little over 3000fps @ 61K psi. That looks right as the case capacity is slightly less than a 6.5-06, and that's close for max safe load in it. Yet the 6.5/.257AI will do an honest 2900fps with the same bullets and using less powder. Perhaps Kirby will chime in here as his case design off the .270 improved design might add some better light to the subject.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 954854, member: 25383"] agree with you yes, but also disagree with you somewhat. Heat is what erodes the throat, and not basic pressures by themselves. Low pressure does tend to avoid the issue of blasting the throat and barrel with unburnt powder, or hot burning gases with intensity. The basic shape of the case and neck also have a good part of this equation. Forty degree and beyond shoulders with at least a caliber and a quarter neck length seem to give far better throat lives. The 6.5/284 has a 35 degree shoulder, and this is a big plus for that particular cartridge. Yet the neck length is barely adequate. Had it been another .06" to .093", I think we're looking at a spectacular cartridge. 3200fps with a 140 grain bullet and H1000 powder powders seems like 75K psi pressures to me. Maybe I'm wrong, but a look in several manuals doesn't even come close to that. The Hornaday manual is 500fps slower, but also can see that load to be a little light. A heavy load of Magpro in that case and using the 140 grain bullet will get you a little over 3000fps @ 61K psi. That looks right as the case capacity is slightly less than a 6.5-06, and that's close for max safe load in it. Yet the 6.5/.257AI will do an honest 2900fps with the same bullets and using less powder. Perhaps Kirby will chime in here as his case design off the .270 improved design might add some better light to the subject. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Throat Burner
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