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Old 11-20-2010, 07:28 PM
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looking at have a 6mmai build for my grandson 16 birthday. looking for some ideas on barrel length and twist for any 85gr tsx bullet. The gun will be mostly used for deer.
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Old 12-07-2010, 06:57 PM
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Location: Oklahoma
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The 6mm A-I and the 85 gr. Barnes TSX should perform well with a 1-10" twist rate....

By HIS stripes, we are healed...
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Old 12-08-2010, 03:32 AM
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Location: Mooresville, IN
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The standard for the parent case is 1:9, which will stabilize all but the longest target bullets in that caliber. The slightly slower 1:10 twist should allow a bit more velocity to be realized, but you're really splitting hairs on that count. One of those two will certainly be suitable.
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Old 12-08-2010, 04:43 AM
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Join Date: Mar 2005
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I used a 1/10 twist barrel in my 6RemAI @ 25" long barrel. I also use 1/10 twist in my 243AI and 243.

I've never shot the Barnes bullets in my 6RemAI mainly use that rifle for antelope with 95gr Partition.

Nosler making a 90gr E-Tp and Berger is coming out with a 87gr VLD hunting bullet for the 1/10 twist 6mm barrels.

I've done in 6mm 1/8,1/10,1/12,1/14 twiast barrels. If your building the 6RemAI on a short action I'd do the 243AI get alittle more magazine length. Sounds like a good project
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Old 01-29-2011, 06:07 PM
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Join Date: Jan 2011
Location: Kalama Washington
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I inherited a 6mm AL Mauser, Timney Trigger, 24"Broughton 1:10 twist

47gr h4831 sc 3005 fs 95gr NBT shot lots of deer and coyotes.

47.5gr h4831 sc 3120 fs 85gr tsx barnes very accurate
Shot a doe at 75 yds headon bullet weighed 83gr bullet traved

Really fun to shoot.
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Old 02-08-2011, 04:28 PM
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Join Date: Dec 2010
Location: Texas
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I too would use a little faster twist like 1:9 or 1:9.25. At some point when your grandson gets older he might want to use a heavier and most likely longer bullet in this gun. I have a Savage 243 and they twist their 243's with a 1:9.25 rate. I strongly believe this helps with the heavier bullets that are longer with the high BC's. I'm sure he'll love it !!
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Old 02-09-2011, 06:51 AM
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Join Date: Mar 2010
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Originally Posted by old roper View Post
If your building the 6RemAI on a short action I'd do the 243AI get alittle more magazine length. Sounds like a good project
I'm with old roper, except I'd do it in a .260 Rem instead.
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