Ackley Improved chambers


July 18, 2006, 04:36 PM
I have 3 rifles I would like to chamber to Ackley chambers. Is it possible to rent a reamer and go/no go gauges and hand ream the chambers with an extended T-handle as there is not too much steel to remove? I'm a retired tool maker and don't have access to a lathe. I feel it should be an easy project but want to check before I do this as there is probably something I haven't thought about. Calibers are 25-06, 30-06 and 338-06. What are your thoughts on this?


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July 18, 2006, 04:42 PM
Someone will probably correct me on this, but it was my understanding that one of the main points of AI chambers is that they're really easy to do and easy to fire-form your brass for. That said, I wouldn't want to try to hand-ream a Ruger barrel without some pretty heavy equipment.

Jim Watson
July 18, 2006, 04:44 PM

Even though the AI chambers are designed to fire and fireform standard loads, the barrel should be set back a turn in the rechambering process to ensure correct headspace. You would need that lathe.

July 18, 2006, 05:00 PM
See, I told you someone would correct me :D

August 12, 2006, 10:48 PM
I knowingly bought a Rem 700 VS in .22-250 with a bad chamber just to punch out to the Ackley version. Sweetest crow buster I have ever owned with longest witnessed kill at 410 yards.
Consistently shot sub 1/2" groups with Remington Bbl on this rifle, even when fireforming cases. (Expect to lose about 1 in 15-20 cases during fireforming.
Full length resize new casings, and trim cases just enough to square up the shortest one of the lot you have. They are going to stretch during fireforming and you want enough material left so you don't end up with thin neck's.
Use a heavier flat base bullet with a long Ogive, and seat them out to engage rifling .002"-.003" for a crush fit. This will help ensure that your casings heads sits square against bolt face. Use a bulkier powder that will give you a full case..even better is a mildly compressed charge that still falls 10% below max load pressures for safety. And lastly.....keep a good chamber brush on the bench with you and clean the chamber frequently when Fireforming. Oil, unburnt powder kernels and powder residue in the chamber that will ruin a good case.
It never ceases to amaze me to put in a standard casing and pull the trigger, rack the bolt and have a different case eject into my hand. (Yeah, I am easily amused.)

A Local gunsmith (Springfield Mo) only charged me $40.00 to rechamber my rifle and another $15.00 to recrown it.

Get a professional to do the chambers for you......In the long run I think you will find the investment was worth it.

BTW.....The .25-06 is already an overbore cartridge and you probably won't see a real benefit to the Ackley treatment...if velocity is what you are after? What you will find is less case stretch with the minimum body taper, and positive indexing with the 40 degree shoulder.
As for the .338-06...sounds like a fun 1000 yard varminter to me.

Good Luck

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