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338 Edge Ackley?

 
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  #1  
Old 07-26-2008, 08:47 AM
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338 Edge Ackley?

Does anyone chamber this caliber? I wouldn't really do it for a ballistic gain, but I hate trimming, plus I could have lower pressures and longer brass life. Looking on ammoguide there's a bit of room to blow out the case and make the shoulder sharper.
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Old 07-26-2008, 08:54 AM
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Quote:
Originally Posted by Tyler Kemp View Post
Does anyone chamber this caliber? I wouldn't really do it for a ballistic gain, but I hate trimming, plus I could have lower pressures and longer brass life. Looking on ammoguide there's a bit of room to blow out the case and make the shoulder sharper.
This is also known as the 338 O'Brien. My gunsmith has made a few of them.

JD338
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Old 07-28-2008, 11:39 AM
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It can be "improved" , with an Ackley improvement you would gain very little it already has a reasonably steep should and not alot of body taper.

I'f I were going to go through the hassel of fireforming brass I'd Ackley improve the 338 Lapua , youll get a step up in velocity and the cases are far better quality.
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Last edited by James Jones; 07-28-2008 at 11:40 AM. Reason: missed
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Old 07-28-2008, 07:17 PM
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But it can't be done in a standard action. Really would like to use the Savage target action.
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Old 07-28-2008, 07:38 PM
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Who told you that ? , you have been missled.

Several builders use the Savage action with Lapua based rounds , If I'm not mistaken I think Kirby Allen has done a few ,Kevein rayhill does alot of them he has a "Rayhill Rocket" thats a 7mm based on the 338 Lapua case
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Old 07-28-2008, 07:59 PM
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Here is a quote from Fred Moreo of Sharp Shooter Supply. Not to discredit Kirby or Kevin, but I would trust Fred's opinion.

I get this question 15 times a week. The short answer is no, the Savage action was never engineered for cases that big. I have discussed this with several engineers and custom action builders, that all came to the same conclusion. A case of that size needs a .750" diameter bolt, and a 1-1/8" barrel shank, minimum.
I know from personal experience on a gun that I built for myself that after less than 100 rounds, it experienced lug set-back. There is not enough surface area on the bolt lugs for that kind of pressure, let alone enough to provide a cushion for over pressure.
There are several custom action makers that will build express actions for those class of cartridges. Probably the most reasonable is Stiller's Precision firearms. Sako made some in .338 Lapua, in a tactical rifle.
The .338 Lapua seems to intrigue alot of shooters that "must have one", but I would suggest before you jump in with both feet, find someone that has one and beg to shoot it first. You might change your mind about what fun is all about.
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Old 07-28-2008, 08:11 PM
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I guess all the one built on Rem 700's and othe Savage action are a hoax?

I don't see any logic behind this needing a .750" bolt , the bolt diameter has zero bearing on it , all the stress is imparted on the lugs of the bolt head and the lug recesses in the action.

If a Sacage is barreled just like a Remington it will handel any sane perssures a handloader will run in a Lapua case.

If you were to rebate a rim of the lapua case to fit into a magnum bolt face would that make it any better? , no the case head is where most of the trouble comes from because it not rebated like other RUM , the case is slighly fatter but it will work.

Call Kevin Rayhill and talk to him about it , he is the guy that Fred Morro calls if he gets in a bind
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