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Old November 8, 2013, 12:25 AM   #1
TheDutchman19
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6.5mm/08 AI verse 260 AI

What, if any, is the differences between these two cartridges? It has been a little challenging finding info on them as well.
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Old November 8, 2013, 07:20 AM   #2
Bart B.
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Name only if the AI part is the same.

.260 cases are a bit longer than 6.5x.308 and that may be an issue depending on who makes the chamber reamer.

Last edited by Bart B.; November 8, 2013 at 07:38 AM.
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Old November 8, 2013, 08:25 AM   #3
TheDutchman19
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Bart

If you had to choose one, is there a preference?
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Old November 8, 2013, 10:50 AM   #4
old roper
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The 260 case since your not having to neck down from the 308 is little easier and if you got in a bind if 260AI is headspace right you can fire factory ammo in the 260AI chamber.

http://www.mansonreamers.com/Instruc...y%20Gaging.pdf

I've always build my Ackleys using the parent case and I like to use new brass so I've got pretty good history from the start.

Well good luck
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Old November 8, 2013, 11:01 AM   #5
TheDutchman19
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Great input. That's what I was hoping for.

Other than the actual shot going through the barrel, is there any other down side to fire forming my cases in my Match grade barrel?
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Old November 8, 2013, 12:51 PM   #6
Bart B.
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I'd stick with either original. AI'd cases have less barrel life than originals and the small velocity increase with the same pressure levels isn't worth a shorter barrel life.

260 Rem gets about 2000 rounds of best accuracy from the best barrels. AI versions can reduce that by 30% or more.

Fire forming cases wears out barrels just like normal loads of the same type.

Last edited by Bart B.; November 8, 2013 at 01:06 PM.
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Old November 8, 2013, 03:47 PM   #7
old roper
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The 260,7-08,243 and 308 all have the same headspace.

Two way to fireform. You can fireform with standard load for the 260 which can be just the start load or you can use COW method 12/13gr Bulleye and filler hold the muzzle up and that fireform your case.

Since I can reload at the range also if I can get 10 Ackley cases I can reload those 5/6 times for load development and sometime you may get above max velocity with a max load.

I've never build a 260AI but I did look at it along with the 6.5x55AI but I opt for the 6.5x284 Norma. I'm shooting 243AI,35 WhelenAI,222AI,223AI and the SAAMI spec 280AI also shooting customs in 222,223 and 243.

I rebarrel when accuracy drops off and I've never found the Ackley wear a barrel out faster. My 280AI was a factory 280 and I shot a Kreiger barrel 35 Whelen and later rebarrel that to the 35 WhelenAI.

I like shooting the Ackleys.
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