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Author Topic: 308 Ackley in Contender?  (Read 834 times)

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Offline Robert

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308 Ackley in Contender?
« on: March 03, 2003, 06:40:15 PM »
My New Contender Loadbooks USA has loads listed for the Contender in .308. In the past, I heard that both the .308 AND 7.62x39 were too much for the Contender because of the amount of taper in the case causing excessive. What about a 308 Ackley improved? Would this work, and IS anyone chambering it?
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Offline KYODE

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308 Ackley in Contender?
« Reply #1 on: March 03, 2003, 11:49:07 PM »
NO WAY! has to be a misprint or interpreted wrong. sure it doesn't say for encore. :?
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Offline bsekf

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308 Ackley in Contender?
« Reply #2 on: March 04, 2003, 02:36:43 AM »
Well, the 308 AI has about the same case capacity as the 309 JDJ and sure, you could put it on the Contender BUT you gotta keep the pressure below 45 K.  Max. listed loads for the 308 AI would be in the 55-60K range.  

There are a lot of cartridges that push the Contender envelope, you have to pay attention to your reloading.

If some publication lists even the stock factory 308 as a Contender cartridge, IT IS A MISPRINT.
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Offline contendernut

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308 Ackley in Contender?
« Reply #3 on: March 04, 2003, 04:04:59 AM »
The 30 Alaskan Bower is a 307 Ackely.  With proper loads, it is perfectly safe.
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Offline Hawkeye

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The 309JDJ & 30 Alaskan are straightwall
« Reply #4 on: March 04, 2003, 05:33:24 AM »
You need to remember the cartridges mentioned are straight wall (309 & 30 AK) and create less force on the frame than a case with tapered walls like the .308. That is why they work. Force is projected to the walls and this causes the case to grip the chamber wall and this keeps the case from forcing against the frame and stretching the frame. I sure wouldn't want to fire or own a frame that has been fired with a .308AI in it. This is just my understanding after checking into the JDJ rounds and getting a 309JDJ and getting ready to order another from them.

Mike
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Offline Robert

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Page 254 in the new book...
« Reply #5 on: March 04, 2003, 04:03:35 PM »
Right after the 30 Herret, in what I beleive is the newest Load-books for Thompson/Center CONTENDER.  It isnt only in MY book.  I saw it in another one that was for sale before I got this copy.  It lists a 150 gr bullet with 48.0 grs of IMR 4064 @2730 fps.  Dosent sound right to ME either.  I like Loadbooks data, but this could get somebody hurt.  This dosent say anything about a straight walled case, it is for normal .308 Winchester.
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Offline TopGun

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308 Ackley in Contender?
« Reply #6 on: March 04, 2003, 06:02:35 PM »
Ouch!! There is no way I would shoot that in one of my Contender's, and I'm crazy.  If anyone wants a hi-powered wildcat, get the Encore. Even the Case head on those cartridges must be kept to paerent 375H&H head size. Close your eyes...squeeze....duck!  Good Luck!  I would not do it or even advocate using the case with reduced loads. Accidents, just like - -iT, happens!
Just my $.02
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Offline Doesniper

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308 Ackley in Contender?
« Reply #7 on: March 05, 2003, 12:46:08 PM »
I asked a question about the causes of "frame stretch" with regard to the straight walled Ackley cases and got little to no info on the subject.  If the "bolt thrust" caused by a load over 40,000 to 45,000 cup is the reason for the frame to be damaged, then the Ackley improved case would eliminate the rearward damaging thrust, and allow greater chamber pressures.  The 308 AI would be safer than the 308 due to less "bolt thrust". If there is another reason for the limit to use of lighter pressures in the Contender, or of what causes a frame to stretch I have no idea what they would be, nor has anyone on this sight or any other  been able to tell me.
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