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Long Range Hunting & Shooting
thoughts on new project.
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<blockquote data-quote="adam" data-source="post: 338952" data-attributes="member: 9382"><p>I forgot to mention my velocity's were with 140gr hdy sst </p><p></p><p>Everything i have read indicates that the 260 and 6.5x55 are essentially identical in performance. Its going to come down to your personal preferences on brass and actions and fun factor of your preferred wildcat.</p><p></p><p>There is a slightly larger case volume in the swede, (57 gr of water vs 53) </p><p><a href="http://kwk.us/cases.html" target="_blank">Case Capacities</a></p><p></p><p></p><p>But the 260 will be slightly more efficient with a slightly shorter powder column. Ackley improving a case will add between 2.5-5% volume, depending on the taper. I think the 260 will benefit slightly more from AI, either way the actual performance will be within 25-65 fps given equal bbl lengths with a slight edge to the swede.</p><p></p><p>So bottom line you can safely estimate 50-100 fps more for AI to both cartridges... (usable case volume for the 260AI with h4895sc is in the 48.5gr range.)</p><p></p><p>Subtract 25-50 fps per inch from the 28" bbl and get a reasonable expected speed from both of around 2800-2900's in the 140 class bullets.</p><p></p><p>I believe the only other consideration (aside from brass availability) will be action availability and preference... if i am not mistaken the 6.5x55 has a slightly larger rim diameter which will mean opening the bolt or using an action with the correct bolt head size.</p></blockquote><p></p>
[QUOTE="adam, post: 338952, member: 9382"] I forgot to mention my velocity's were with 140gr hdy sst Everything i have read indicates that the 260 and 6.5x55 are essentially identical in performance. Its going to come down to your personal preferences on brass and actions and fun factor of your preferred wildcat. There is a slightly larger case volume in the swede, (57 gr of water vs 53) [url=http://kwk.us/cases.html]Case Capacities[/url] But the 260 will be slightly more efficient with a slightly shorter powder column. Ackley improving a case will add between 2.5-5% volume, depending on the taper. I think the 260 will benefit slightly more from AI, either way the actual performance will be within 25-65 fps given equal bbl lengths with a slight edge to the swede. So bottom line you can safely estimate 50-100 fps more for AI to both cartridges... (usable case volume for the 260AI with h4895sc is in the 48.5gr range.) Subtract 25-50 fps per inch from the 28" bbl and get a reasonable expected speed from both of around 2800-2900's in the 140 class bullets. I believe the only other consideration (aside from brass availability) will be action availability and preference... if i am not mistaken the 6.5x55 has a slightly larger rim diameter which will mean opening the bolt or using an action with the correct bolt head size. [/QUOTE]
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