I've got a 6.506AI match reamer from Dave Kiff at Pacific Tool and Guage, with a .292 neck and 120 thousandths freebore. I set it up with this freebore so magazine feeding would be possible. It has never been used.
I've also got a 260 Rem match reamer, also from Dave Kiff, with 120 thou freebore, .292 neck, never been used.
These are both solid pilot reamers setup for the 139-142 class bullets.