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6.5 comparisons
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<blockquote data-quote="Viking264" data-source="post: 1268341" data-attributes="member: 97833"><p>All,</p><p>I've been running some comparisons between 6.5x55 (standard), 6.5x55 AI, 6.5-284, and .260 Rem (loaded in long action). I'd like to keep this thread confined to these cartridges (in other words, please refrain from interjecting recommendations of looking at the 6.5 CM, 6.5x47, 6.5-06, 6.5 Sherman, etc.). I will preface all of this by stating that I am primarily a shooter of .284 Win (long action) and 6.5x55. I also shoot a bit of .260 Rem.</p><p></p><p>Using QL to determine required mass of RL26 to propel a 140-grain ELD to 2950 fps, and then comparing the pressures generated, grains required, and so on, I see some interesting things, with same-length barrels:</p><p></p><p>.260 Rem (standard) has the highest ballistic efficiency, followed by the standard 6.5x55, then the 6.5x55 AI, and last the 6.5-284.</p><p></p><p>Lowest pressures were generated by the 6.5-284, then the 6.5x55AI, then the .260 Rem, and lastly the standard 6.5x55.</p><p></p><p>Mass of RL26 required to achieve 2,950 fps (as calculated by QL) was least with .260 Rem, then 6.5x55, then 6.5x55AI, and (most required was) 6.5-284.</p><p></p><p>Admittedly, I load my 6.5x55 to higher pressures than SAAMI or CIP, before someone asks.</p><p></p><p>I raise all of this because I have been toying with the idea of obtaining a 6.5-284 barrel for one of my rifles. So much has been written on the web about horrendous barrel life of this cartridge, I figured I'd look at pressures. For a 26" barrel, 50,979 PSI. I'm thinking that the barrel life can't be that bad. Assume not shooting rapid fire and letting the barrel cool; am I wrong? At that pressure, would I not be expecting higher round count than 1K?</p><p></p><p>I must say that I was surprised at the results with the .260, by the way.</p></blockquote><p></p>
[QUOTE="Viking264, post: 1268341, member: 97833"] All, I've been running some comparisons between 6.5x55 (standard), 6.5x55 AI, 6.5-284, and .260 Rem (loaded in long action). I'd like to keep this thread confined to these cartridges (in other words, please refrain from interjecting recommendations of looking at the 6.5 CM, 6.5x47, 6.5-06, 6.5 Sherman, etc.). I will preface all of this by stating that I am primarily a shooter of .284 Win (long action) and 6.5x55. I also shoot a bit of .260 Rem. Using QL to determine required mass of RL26 to propel a 140-grain ELD to 2950 fps, and then comparing the pressures generated, grains required, and so on, I see some interesting things, with same-length barrels: .260 Rem (standard) has the highest ballistic efficiency, followed by the standard 6.5x55, then the 6.5x55 AI, and last the 6.5-284. Lowest pressures were generated by the 6.5-284, then the 6.5x55AI, then the .260 Rem, and lastly the standard 6.5x55. Mass of RL26 required to achieve 2,950 fps (as calculated by QL) was least with .260 Rem, then 6.5x55, then 6.5x55AI, and (most required was) 6.5-284. Admittedly, I load my 6.5x55 to higher pressures than SAAMI or CIP, before someone asks. I raise all of this because I have been toying with the idea of obtaining a 6.5-284 barrel for one of my rifles. So much has been written on the web about horrendous barrel life of this cartridge, I figured I'd look at pressures. For a 26" barrel, 50,979 PSI. I'm thinking that the barrel life can't be that bad. Assume not shooting rapid fire and letting the barrel cool; am I wrong? At that pressure, would I not be expecting higher round count than 1K? I must say that I was surprised at the results with the .260, by the way. [/QUOTE]
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