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6mm / 243 105 GR A-Max - What Cal?

 
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  #1  
Old 12-09-2010, 08:21 PM
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Join Date: Mar 2010
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6mm / 243 105 GR A-Max - What Cal?

Hey guys -

Looking for a new barrel for my LRPV.

I've decided that the 105 gr A max bullet is the one I'd like to base the build around, main purpose is 600 yd bench shoot and prairie dog shooting from 400-700 yards.

The question I have floating around in the ol' knoggin is - what brass should I put ehind the bullet?

Looking for MINIMAL brass work with MAXIMUM speed and accuracy. Goal is to have a few hundred rounds to shoot the long distance dogs that my 223 and 204 can't reach.

I'd like to scream the thing out at 4000 fps

But seriously, what do you have in mind? Thanks!
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  #2  
Old 12-09-2010, 09:34 PM
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Location: Ohio
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Re: 6mm / 243 105 GR A-Max - What Cal?

Forget the 4,000 fps with a 105 gr. bullet in .243. I pushing the 107 bergers around 3200 to 3300 fps right now with a 6 -284. You could get alittle more with a 6- 06 and a long barrel but to get to 4,000 fps your looking at a belted mag. case. If you do build one make sure your twist is fast enough to stablize the the heavy bullets.
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Old 12-09-2010, 09:41 PM
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Re: 6mm / 243 105 GR A-Max - What Cal?

Big smiley behind "4000 fps" means I know it's a pipe dream.

I just really want to try to cheat the wind out to 600 or so. It really kicks on the plains of KS, CO and SD. Never seem to have a calm day.

Is that 6-284 similar to what I could get from a 243 AI?
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  #4  
Old 12-09-2010, 11:13 PM
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Re: 6mm / 243 105 GR A-Max - What Cal?

I'm getting 3300 with a .243 AI and 105 Bergers...can hit 3400 if I really want to push the limit...
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  #5  
Old 12-10-2010, 12:30 AM
B23 B23 is offline
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Re: 6mm / 243 105 GR A-Max - What Cal?

I'm pretty sure a 105Amax would turn to dust and never even hit the target if launched out of anything at 4000fps
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  #6  
Old 12-10-2010, 05:41 AM
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Re: 6mm / 243 105 GR A-Max - What Cal?

I shoot 500 meter groundhog matches with a 6BR and 6 Dasher (both 8 twist), but neither will get much over 3,300 fps. In fact, about 25% of groundhog match shooters favor this cartridge because of its long range accuracy. The 105 gr. A Max with Lapua brass, RL15 or Varget, is very good. But I prefer Berger, BIB and Sierras in my custom rifles. I do have a factory Cooper 6BR 8 twist that loves the A Max.
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  #7  
Old 12-10-2010, 02:01 PM
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Re: 6mm / 243 105 GR A-Max - What Cal?

Quote:
Originally Posted by Gene View Post
I shoot 500 meter groundhog matches with a 6BR and 6 Dasher (both 8 twist), but neither will get much over 3,300 fps. In fact, about 25% of groundhog match shooters favor this cartridge because of its long range accuracy. The 105 gr. A Max with Lapua brass, RL15 or Varget, is very good. But I prefer Berger, BIB and Sierras in my custom rifles. I do have a factory Cooper 6BR 8 twist that loves the A Max.
I shoot a 6/250AI with mostly 105 grain AMAX bullets and the big Sierras. It's good for a hair over 3150 fps with H1000 powder and a 26" barrel. 3000fps seems to be the accuracey load for the barrel. Like to know how to get 3300 fps out of the 6/250AI!! And that's with a bigger case.

I did look at ten targets earlier in the week that had ten bug holes in the bull on each one. The round was a 35 remington case necked down to 6.5, and shortened a little bit. The shoulders looked like 30 degree, and the body was similar in taper to an Ackley. Kinda like a 6.5PPC but on steroids. The gun was an HBR gun so the case held a similar amount of powder to the 30-30
gary
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