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22-6mm Extended-Long Range Groundhog

 
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  #22  
Old 11-04-2012, 01:11 PM
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Re: 22-6mm Extended-Long Range Groundhog

Quote:
Originally Posted by Trickymissfit View Post
The BG is probably the single most efficient 6mm round out there, and is known to group similar to a 6BR, but with much better range and heavier bullet capability. Cases can be made very cheaply, and are really pretty easy to form out of .243 brass. All it really is, is a 6BR with .30" added in the middle. No over priced brass to buy and case life and barrel life are way up there. The easiest one to do is the 6/250AI with the 6mmAckley neck. you end up with a neck length of about .32" and a 40 degree shoulder (2" case length) after shrinkage from fire forming. I form my cases right now out of generic .243 brass that's shortened to about 1.925", but the next batch will be only about .005" shorter than the chamber neck length (about 1.937"). I'm seeing about .030" shrinkage. But I may do my next barrel for a 1.472" headspace and the full 6mmAI neck & shoulders. That way I can use nearly all the .243 brass. Guess it's to each his own.
gary
I need to make a correction in my post. The BG round is similar to the 6BR, but about .50" longer in the main part of the case body. The neck and shoulders are very similar to the older 6mm HLS. There are two versions of it. One has .0125" of taper per foot, and the other has .0175" of taper per foot. Case headspaces off a .300 Savage head space gauge with max overall length being about 2.020". I found the reamer drawings last night. Cases used were .243 lapua, and it will push a 107 grain Sierra to 2950 fps
gary
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  #23  
Old 11-04-2012, 05:54 PM
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Join Date: Mar 2010
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Re: 22-6mm Extended-Long Range Groundhog

Quote:
Originally Posted by Trickymissfit View Post
I need to make a correction in my post. The BG round is similar to the 6BR, but about .50" longer in the main part of the case body. The neck and shoulders are very similar to the older 6mm HLS. There are two versions of it. One has .0125" of taper per foot, and the other has .0175" of taper per foot. Case headspaces off a .300 Savage head space gauge with max overall length being about 2.020". I found the reamer drawings last night. Cases used were .243 lapua, and it will push a 107 grain Sierra to 2950 fps
gary
My 6mmXC does the same (2950fps. w/ 107g SMK or 108g. Berger Target),,,,,, and I can buy Norma brass, don't have to make it!
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  #24  
Old 11-05-2012, 11:10 AM
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Re: 22-6mm Extended-Long Range Groundhog

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Originally Posted by shortgrass View Post
My 6mmXC does the same (2950fps. w/ 107g SMK or 108g. Berger Target),,,,,, and I can buy Norma brass, don't have to make it!
must be very hot!
gary
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