Looking at the Alpha Munitions website they recommend a measurement of .470 to .4714 at the 0.200 line. The reamer print I got from JGS (#1297) for the David Tubb reamer is .4695 at the .200 line. Difference of .0005 if comparing to the lower end of the Alpha recommendation. Is this significant and what issues would a person have if they used Alpha brass with the JGS #1297 reamer? I have heard that Peterson brass is going to make 6XC brass fairly soon as well but not sure which reamer it would work best with? Finally, the .090 freebore is best for which bullets? Thanks.