Posted by Michael Bell on
URL: http://oldforum.flyshooter.com.au/New-Gun-time-and-its-all-your-fault-tp5708460p5708470.html

      Not sure about the freebore numbers as it depends on which projectile you intend to use....so...I help the gunsmith out with a dummy round from which he can work.Just seat a projectile with  the boat tail / shank junction of the pill sitting just above the neck/ shoulder junction of the case...if, as an example, you use a 105 berger hybrid for this I know from experience the Copper Head 103's ( which are shorter in the bearing surface) can still be seated into the lands with some case neck to spare.  It's a bit of a juggling act because the BRX doesn't have a very long neck.
Best thing ....choose a projectile and stick with it.

This process might be a bit hard if you don't have any BRX cases.......I can send you a couple over that might not be exact to your reamer but should be close enough for this exercise!...Just let me know.

Regards,
Belly