Freebore - Criterion and Shilen Barrels

[Phil3]

Does anyone know how much freebore there is for Criterion and Shilen prefit Savage barrels? In my case, for the 6mmBR cartridge. I need to be sure that there is the right amount for the bullets I plan to use.

Thanks.

Phil

[northlander]

Phil,
The freebore on the Criterion 6 BR Norma is .093. Shilen is very similar but Shilen will custom extend the freebore if needed on custom barrel orders.

Jim Briggs

[Phil3]

Jim,

Thank you.

Does Criterion (and Shilen) use the same freebore for all twists with 6 BR Norma? I ask because I will be shooting 100 - 200 yards, using light short bullets. A longish freebore for such bullets will limit my ability to touch the lands. Jim Kiff (Pacific Tool & Gauge) comments at 6mmbr.com seem to indicate .093" would be good for bullets around 90 grain. See http://www.6mmbr.com/kiffreamer.html. Specifically where he asked and says,

"Q: Without revealing any trade secrets, what throat lengths do you recommend for a 6mm BR case?

We normally go with a 1.5 degree lead angle, unless the customer wants something different. For 60-68gr bullets we recommend a .060" freebore. For the 80gr bullets, .080" is a good setting. For the 100-107gr VLDs, a .115" -.120" freebore will allow you to get the base of the bullet up out of the doughnut area. This will save you lots of aggravation over the life of the barrel.If I shoot the lighter 60 - 68 grain bullets, seems like .060" is best. I am unsure whether to try to get a slow twist, short freebore barrel, or just get a Criterion in 1:10 twist with the .093" freebore and should 80 - 100 grain bullets".

http://www.6mmbr.com/kiffreamer.html

Once I get some answers, I will be ordering the barrel from you, plus some other stuff. I have no bias toward Criterion or Shilen, but your opinion is welcome.

Thank you.

Phil