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Barrel purchase.

 
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  #8  
Old 02-21-2005, 07:10 PM
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Join Date: Jan 2005
Location: Auburn, Alabama
Posts: 84
Re: Barrel purchase.

How is a cartridge "blown-out?"

I can't come up with a wildcat cartrige. Feels like re-inventing the wheel. I want a low recoil deer cartridge. I love the quarter bore! Kirby you struck gold with yours! I'd like to do something with a smaller casing. Any ideas? I think the 257 Roberts AI sounds interesting as far as considering someone elses creation or alteration.
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  #9  
Old 02-22-2005, 10:47 AM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
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Re: Barrel purchase.

Auburn Tiger,

Blowing a cartridge out is when you chamber a fireforming load, lets use the 257 Roberts for example.

You load the virgin 257 Roberts round in a chamber cut to the 257 Roberts Improved chamber.

The original Roberts has a shoulder diameter of .429" compared to the Improved version which has a shoulder diameter of .459" in diameter.

When the round is fired, the pressure builds in the standard Roberts case and this forces the brass case walls out until they are stopped by the Improved dimensioned chamber. When you extract the brass you have a Roberts improved case with the larger diameter shoulder and less body taper, this is what is ment by blowing out the case.

Teh Roberts Improved is a very impressive wildcat, in fact it gains the most velocity of any of the Ackley Improved rounds over its parent case.

Still, it is relatively long and does not work the best in a true short action and is much more comfortable in a standard length action. If you use this receiver length you would be better off with a 25-06 AI as it will offer much more performance with very little increase in recoil. Brass is also easier to find.

The 25-06 AI comes embarrasingly close to 257 Wby performance in a 24" barrel.

Good Shooting!!

Kirby Allen(50)
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  #10  
Old 02-22-2005, 02:19 PM
 
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Re: Barrel purchase.

Fifty,
Glad to see you're still alive and kicking! Haven't seen you post recently, but I would guess that you're kept pretty busy with production on you .257AM's! Great job, and good shootin'
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