What free bore for 6.5x47? Ideal oal for aics mag feed 140 vld's

Countyboy

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Jul 22, 2012
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Just about to send a dummy round with friends reamer for a second barrel for my MAK tubegun rem 700 mag feed. Reamer is, I believe a .16 freebore. Firing pin has been bushed.

I use it for 300-600 f class and general target use. My current barrel, a shilen 7 contour 1-8 26" has 1250 down the pipe. It likes the 140 vld's the best at an oal of 2.815. Jammed 10 thou. I get very low es sd with 39 gr h4350 at 2780 fps.

My new barrel is a Krieger 1-8 contour 10 26".

I am thinking of an oal of 2.80 for my new barrel for 140 vld's. I am planning on mostly vld's and hybrids but would also like to have the ability to use 123s. I would like to maintain the ability to mag feed vld's throughout the barrels life. I have aics mags with max oal of 2.88. I don't worry about max velocity. ES and SD are primary to me.

Does this sound good? Just thought I would check with you all first.

Countyboy from Canada
 
Ar15barrels took these ogive measurements to the lands using a .167 lead reamer.

123smk 2.765
130jlk 2.850"
140berger LTB 2.740"
140berger VLD 2.790"
140jlk 2.850"
142smk 2.740"

Hope this helps a little.