He will cut it from the same reamer (1.350) that he does the barrel.
You can fire-form your brass yourself. My plan (anyone tell me if this is wrong) is to fireform then use my .308 mic (
http://www.midwayusa.com/viewProduct...tnumber=574297) to find the datum point (should work since the neck up is .308 right?) and reset the shoulder .002" like I do on my .308 gun. Use the case guage as a double check.
You should hear the shoulder hit the case guage as you drop it in and then have the cartridge flat on the back end to know you are in the right spot if I understand the process.
If the case guage has the bore dia at the end, I'm guessing that you can actually set OAL to visually touch where the lands are in the barrel for a perfect shoulder setback and nose to lands fit.
I believe that is why tp555 is going to the 1.350" reamer because you will be able to get up to the lands where you can't on a 1.400 chamber because of the AR15 mag OAL limit.
I just hope mine is in 1.350" :)
Threaded Mode