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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Info on the 6.5 Mystic
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<blockquote data-quote="Mysticplayer" data-source="post: 101319" data-attributes="member: 8947"><p>Actually, the opposite is true. Attached is a link for SAAMI cartridge specs for the 260Rem.</p><p></p><p>The neck length on a 260Rem is 0.765" which is almost the same as the 308 (0.785") from which it is based. </p><p></p><p>A true 260AI will retain that neck length. The only changes would be shoulder angle and body taper.</p><p></p><p>Fireforming does not need any changes to the parent case and factory ammo can safely be fired in this chamber.</p><p></p><p>If your 260AI only has a 264" long neck, then the shoulder must be moved forward from its orig location (approx 0.501"). Factory 260Rem ammo cannot be safely fired in this chamber. A secondary shoulder must first be formed.</p><p></p><p>So in reality, you have made the 6.5 Mystic instead of the 260AI. You load data is definitely in the right ballpark. Maybe a bit hot but then each rifle is a story onto itself.</p><p></p><p>Are your loads compressed at all?</p><p></p><p>See, on the cutting edge and you didn't even know it.</p><p></p><p>So the question I have about your rifle is how did you form your '260AI' brass (264" neck length) simply by fireforming the 260Rem case in that chamber without first forming a secondary shoulder????????</p><p></p><p>The 6.5 Mystic maxes out the 308 case in every dimension, and with the extended throat, the highest capacity that can still hold a long 140gr class 6.5 VLD bullet securely in place.</p><p></p><p>Kind of neat being the first to wildcat something completely different. I have never seen any published wildcat that has the same increase or changes to the 308 parent case.</p><p></p><p>Jerry</p><p></p><p><a href="http://www.6mmbr.com/cartridgediagrams.html#260REM" target="_blank">http://www.6mmbr.com/cartridgediagrams.html#260REM</a></p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 101319, member: 8947"] Actually, the opposite is true. Attached is a link for SAAMI cartridge specs for the 260Rem. The neck length on a 260Rem is 0.765" which is almost the same as the 308 (0.785") from which it is based. A true 260AI will retain that neck length. The only changes would be shoulder angle and body taper. Fireforming does not need any changes to the parent case and factory ammo can safely be fired in this chamber. If your 260AI only has a 264" long neck, then the shoulder must be moved forward from its orig location (approx 0.501"). Factory 260Rem ammo cannot be safely fired in this chamber. A secondary shoulder must first be formed. So in reality, you have made the 6.5 Mystic instead of the 260AI. You load data is definitely in the right ballpark. Maybe a bit hot but then each rifle is a story onto itself. Are your loads compressed at all? See, on the cutting edge and you didn't even know it. So the question I have about your rifle is how did you form your '260AI' brass (264" neck length) simply by fireforming the 260Rem case in that chamber without first forming a secondary shoulder???????? The 6.5 Mystic maxes out the 308 case in every dimension, and with the extended throat, the highest capacity that can still hold a long 140gr class 6.5 VLD bullet securely in place. Kind of neat being the first to wildcat something completely different. I have never seen any published wildcat that has the same increase or changes to the 308 parent case. Jerry [url="http://www.6mmbr.com/cartridgediagrams.html#260REM"]http://www.6mmbr.com/cartridgediagrams.html#260REM[/url] [/QUOTE]
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Info on the 6.5 Mystic
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