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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
260 AI help
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<blockquote data-quote="nkyshooter" data-source="post: 2028316" data-attributes="member: 83787"><p>I shoot 260 AI - it is my favorite rifle with my 6mmBR a close 2nd ... I get 2850 from the Berger 140 hunting vld's without pushing it anywhere near it's limits ... if I chose to push, I could get close to 3000 with the right powder ... more with 130's or 120's - but I want both my brass and barrel to last since they are giving me sub half moa.</p><p></p><p><strong>Max length is 2.045 - trim to length is 2.035</strong> but I recommend not trimming until you pass 2.045 on a few ... then, trim ALL of them to be the same 2.035 ... When you fireform it will shrink in length - possibly to less than 2.035. If it does, it isn't a problem but you might end up with a carbon ring in the chamber just past the end of the case. Just practice good cleaning and you will be ok. As you continue to load/fire, the cases will grow in length but nowhere near the rate/pace a 260 Rem case will grow. This is because the sharper shoulder resists that 'flow' of the brass.</p><p></p><p>Regarding full length sizing and/or shoulder bumping ... If your fired cases chamber too snugly, you will need to full length size to reduce case wall diameter and bump shoulder back. However, if they chamber smoothly you have the option to either full length size or neck only size. Your 'best' accuracy 'potential' comes with cases that are as close to the dimensions of your rifle chamber as possible while still chambering smoothly. This comes with 'fireformed' brass and neck sizing only until it becomes 'too' snug. I utilize a body die for this with my 6BR and would do the same if I had one for my 260 AI. As it is, I use a Lee 260 Rem neck collet sizing die until I need to full length at which time I use my Redding 260AI Full Length sizer. By the way - I spent an afternoon with Ferris Pindell (second "P" in 6mmPPC which was tops on the 100/300yd benchrest circuit for quite some time). Ferris did not full length size unless the chamber was too snug ... which never happened for him because he was running a chamber so close to unfired case dimensions and without pushing pressures. As a result, the cases did not exhibit much growth or 'snugness' ... just hand/glove fit.</p><p></p><p>If it is me and I'm headed for a hunt - I neck size then check for smooth chambering ... if good, I load ... if too snug for comfort for hunting, I full length then check for length, only trim if I must, then load. I always re-verify chambering prior to heading out for a hunt.</p><p></p><p></p><p>Enjoy your 260 Ackley - I find it to be <strong>one of the best </strong>all around blended pros/cons cartridges out there and THE best non-magnum short action 6.5 ... while it won't quite keep up with a 6.5-284, you'll get lots more rounds through your barrel before you're replacing or at least setting back ... even more so when compared to the 6.5 WSM, SAUM or PRC (although if you need super speed with a 6.5 those and the Shermans are all solid cartridges).</p></blockquote><p></p>
[QUOTE="nkyshooter, post: 2028316, member: 83787"] I shoot 260 AI - it is my favorite rifle with my 6mmBR a close 2nd ... I get 2850 from the Berger 140 hunting vld's without pushing it anywhere near it's limits ... if I chose to push, I could get close to 3000 with the right powder ... more with 130's or 120's - but I want both my brass and barrel to last since they are giving me sub half moa. [B]Max length is 2.045 - trim to length is 2.035[/B] but I recommend not trimming until you pass 2.045 on a few ... then, trim ALL of them to be the same 2.035 ... When you fireform it will shrink in length - possibly to less than 2.035. If it does, it isn't a problem but you might end up with a carbon ring in the chamber just past the end of the case. Just practice good cleaning and you will be ok. As you continue to load/fire, the cases will grow in length but nowhere near the rate/pace a 260 Rem case will grow. This is because the sharper shoulder resists that 'flow' of the brass. Regarding full length sizing and/or shoulder bumping ... If your fired cases chamber too snugly, you will need to full length size to reduce case wall diameter and bump shoulder back. However, if they chamber smoothly you have the option to either full length size or neck only size. Your 'best' accuracy 'potential' comes with cases that are as close to the dimensions of your rifle chamber as possible while still chambering smoothly. This comes with 'fireformed' brass and neck sizing only until it becomes 'too' snug. I utilize a body die for this with my 6BR and would do the same if I had one for my 260 AI. As it is, I use a Lee 260 Rem neck collet sizing die until I need to full length at which time I use my Redding 260AI Full Length sizer. By the way - I spent an afternoon with Ferris Pindell (second "P" in 6mmPPC which was tops on the 100/300yd benchrest circuit for quite some time). Ferris did not full length size unless the chamber was too snug ... which never happened for him because he was running a chamber so close to unfired case dimensions and without pushing pressures. As a result, the cases did not exhibit much growth or 'snugness' ... just hand/glove fit. If it is me and I'm headed for a hunt - I neck size then check for smooth chambering ... if good, I load ... if too snug for comfort for hunting, I full length then check for length, only trim if I must, then load. I always re-verify chambering prior to heading out for a hunt. Enjoy your 260 Ackley - I find it to be [B]one of the best [/B]all around blended pros/cons cartridges out there and THE best non-magnum short action 6.5 ... while it won't quite keep up with a 6.5-284, you'll get lots more rounds through your barrel before you're replacing or at least setting back ... even more so when compared to the 6.5 WSM, SAUM or PRC (although if you need super speed with a 6.5 those and the Shermans are all solid cartridges). [/QUOTE]
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