Here is a link for Manson’s, I suggest calling Dave and see if he will rent a finish reamer. If not I think there are forum members who have purchased Manson 6.5 Greendel finish reamer. You might be able to rent or borrow a finish reamer for the 6.5 Grendel from a forum member.
https://mansonreamers.com/catalog/
I used the Google Custom search feature for this forum and found these two threads. Look at these threads before calling Manson.
http://www.65grendel.com/forum/showthrea...ing-Reamer
http://www.65grendel.com/forum/showthrea...he-chamber
Here is a link to the google custom search feature if you want to search for more threads with Manson reamers mentioned.
https://cse.google.com/cse?q=+&cx=016368...aqd_0xcu1o
https://mansonreamers.com/catalog/
I used the Google Custom search feature for this forum and found these two threads. Look at these threads before calling Manson.
http://www.65grendel.com/forum/showthrea...ing-Reamer
http://www.65grendel.com/forum/showthrea...he-chamber
Here is a link to the google custom search feature if you want to search for more threads with Manson reamers mentioned.
https://cse.google.com/cse?q=+&cx=016368...aqd_0xcu1o