Freebore/Reamer for 6BR with 110gr SMK

[257Roberts]

Early in the planning phase, but would get a new barrel chambered for 6BR. 28-30 inchest, either 7 or 7.5 twist.

Id like to be able to shoot the 110gr SMK, and I know its very long.

Is there any special considerations I need to account for with regards to freebore?
Or will any 6BR reamer work for this application.

Any first hand experience would be appreciated.

 

[JEFFPPC]

Best bet is seat a dummy round with the pressure ring in the middle of the neck. Give that to your Smith and have him use a throated to adjust the throat accordingly. I am a Sierra guy but gave up on that bullet and went back to 107s. I shot some groups in the low ones with it but could not get it to consistently repeat. 107s have me smiling.

 

[Kracken McGraw]

I’m on the same planning stage but going with the 107’s. My Smith said I would want his longer freebore reamer, which was .104 I believe. Brown truck is bringing barrel today.

 

[One Eye Pete]

If you are going to shoot the 110 Sierra Matchking definitely go with the 1-7 twist unless you are at a high elevation.
I built a gun to shoot the 110 Sierra and 115 DTAC. It is chambered in 6mm SLR and my reamer has a short throat. I use a PT&G unithroater so that I can get the bullet exactly where I want it. I set the freebore so the bullet sits just above the neck shoulder junction. Unfortunately I don't know exactly what the final freebore measures but it is definitely over 0.10. I find the unithroater easy to use but you have to be really careful as it cuts fast, you have to go slow a few thousandths at a time.
The other thing I found with the 110 Sierra is that I had to get it real close to jam to get it to shoot. The bullet has a nice high BC but the 107 matchking is much easier to tune and to keep in tune. With a 6mm BR you can't go wrong with the 107 Sierra or the 108 Berger. What you don't want to do is to go with too long a freebore for the 110, to the point where if you do want to go to the 107 it will sit too far out in the neck.