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243AIor 257AI

 
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  #8  
Old 06-13-2013, 09:03 AM
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Join Date: Feb 2010
Location: Gillette, WY
Posts: 2,650
Re: 243AIor 257AI

Gotta vote for the 243AI out of the two cartridges. Lapua brass, MUCH higher BC bullets (which also yield higher SD). Win-Win. The Roberts is an intriguing little cartridge but the 6mm walks it's dog in all aspects except barrel life.


@Terry Scott also made a fantastic (& better yet) suggestion in the 260AI.


t
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  #9  
Old 06-13-2013, 10:38 AM
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Join Date: Jul 2012
Location: Henderson,NV
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Re: 243AIor 257AI

I will look at the 260AI know.
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  #10  
Old 06-15-2013, 06:22 AM
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Join Date: Oct 2006
Posts: 466
Re: 243AIor 257AI

I have built two 257RAI and two 243W rifles for myself.

I shot 4 mule deer with a 257 in 2012.
The 115 gr Nosler ballistic tip 257 bullet at 3050 fps muzzle [49 gr H4350 =~ 56kpsi] zero'd at 200 yards, scope 1.5" above bore:
At 500 yards this will have a 7 moa elevation correction, 3.6 moa windage correction for 10 mph cross wind, 2087 fps =1112 foot pounds

While I only shot the deer out to 400 yards last year, the cartridge has plenty of power at 500.
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  #11  
Old 06-15-2013, 07:18 AM
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Join Date: Jul 2012
Location: Henderson,NV
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Re: 243AIor 257AI

Thank you Clark for the info
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