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ALLEN PRECISION Teaser...

 
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  #22  
Old 04-27-2011, 12:29 AM
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Re: ALLEN PRECISION Teaser...

.338 Excalibur
The a square design is based off of the 460 weatherby case. The 378 weatherby case as far as I know is a one off with no parent.
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Last edited by Camshaft; 04-27-2011 at 12:34 AM.
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  #23  
Old 04-27-2011, 12:33 AM
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Re: ALLEN PRECISION Teaser...

I think the old A-square you could make out of a 378 wby. The new one called the Excaliber is on it's own rocket ride and a huge non-belted case.
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  #24  
Old 04-27-2011, 12:40 AM
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Re: ALLEN PRECISION Teaser...

Quote:
Originally Posted by Long Time Long Ranger View Post
I think the old A-square you could make out of a 378 wby. The new one called the Excaliber is on it's own rocket ride and a huge non-belted case.
Yea the 338 Excalibur replaced the 338 a-square mag, which is what I think rocky mountain is thinking of.
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  #25  
Old 04-27-2011, 01:01 AM
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Re: ALLEN PRECISION Teaser...

Dose anyone know the base measurement of the 338 excalibur???
be interested to compare to the 416???
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  #26  
Old 04-27-2011, 01:21 AM
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Re: ALLEN PRECISION Teaser...

.580 from jamisons website.
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  #27  
Old 04-27-2011, 02:20 AM
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Re: ALLEN PRECISION Teaser...

Kirby - Not sure where you are getting your A-Square Excalibur brass prices from as I purchased 100 cases directly from A-Square about a year ago and paid $4.00 a case. I just checked A-Square's website and the current cost of Excalibur brass is $40.25/10, $4.02 a case. Not sure where you found it for $6-$8 a case. I would agree that the A-Square brass leaves a lot to be desired and am glad to hear that Jamison is now offering it.

RM - I think you'll find the difference in case capacity between the Excalibur and 338-416 Imp lies in the length of the body. While one could use 338-378 Weatherby brass to make Excalibur, it would end up being shorter in length than the Excalibur case and the belt would have to be turned off. In short, there isn't an easy way to make Excalibur brass from another. Diameter at shoulder 0.566", length from head to shoulder/body junction 2.450", length to shoulder/neck junction 2.633", overall length of case 2.990".

My father and I both have 338 Excalibur rifles. My father's is built around a Ruger #1 in order to go with a longer barrel with muzzle brake and still have a cartable hunting rifle. He shoots 275 gr. Swift A-Frame bullets at 3025 fps from a 27.5" barrel. Mine is built around the Lawton 8500 action, single shot, right bolt/left port. Barrel is 36" plus custom muzzle brake. I'm shooting 300 gr. SMK at a little over 3000 fps.

Kevin
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  #28  
Old 04-27-2011, 02:32 AM
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Re: ALLEN PRECISION Teaser...

As far as the Excalibur's origin, it is a 300 Pegasus (A-Square creation) necked up to 338 caliber. A-Square's manually doesn't go into much detail about where the Pegasus case dimensions came from. They were looking to get a 180 gr. 30 cal. bullet up to 3500 fps at safe pressures and the Pegasus cartridge is what came out of that endeavor.

Kevin
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