New 6.5 CM Build Advise

Feb 13, 2017
144
1
18
Carrizo Springs, TX
#1
Men,

About to get a 6.5 CM built. Need to decide on either .170” or .199” freebore reamer. I will be shooting the 140 eld m and 143 eld x.

Tons of folks run the sammi .199” and have excellent results with these two bullets and this is all I have ever had in the past with factory rifles. I know that masterpiece uses a .170” freebore reamer to chamber their barrels for the 140 eld m and am curious as to what the advantages and disadvantages to these two reamers would be. I will be using a stiller tac 30 with M5 DBM and AI mags.

Advice would be appreciated!
 
Feb 4, 2014
63
5
8
Alaska
#2
Most recent everyday sniper podcast touched on this subject. Personally I’d run the SAMI reamer, with the shorter free bore on the other reamer, as I understand it, will help with those bullets like the hybrid that still need to be somewhat close to the lands but not seated so long they don’t fit in a mag.
 
Feb 13, 2017
144
1
18
Carrizo Springs, TX
#3
Here is something I learned yesterday. A buddy of mine had a creed built by gap last year that I did load development for. For brass, He broke in and sped up the new proof barrel with 200 rounds of factory 143 eld x. It shot 1/2 minute with factory ammo and 1/4 minute with the load I developed. I asked gap which reamer thaey used to chamber that barrel and it was a .152” freebore. MPA uses a .170” freebore for their rifles set up to shoot hornady as I noted in my first post. So, my question is: What is the advantage to running a sammi reamer with excessive freebore?
 
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