Gunsmithing Need Chamber Recommendation For 308 AR Type Rifle

[jm5546]

I need some help....

I am in the process of building a .308, AR-10 style (DPMS Pattern), high precision bench rifle, utilizing a 20" Kreiger S.S. barrel, with a 1-11.25 twist. I need help in identifying a chamber/reamer that will maximize the rifle's accuracy potential (i.e. consistent <0.5" MOA). Although I will be handloading, I want to optimize the chamber/rifle for Federal 168gr SMK GMM factory ammunition. If possible (a secondary requirement), I would also like it to achieve the same accuracy using Federal 175 SMK GMM ammo.

In researching chamber reamers, I found numerous recommendations (95 Palma, Modified Palma, 2011 Full Bore, Bisley, Obermeyer 3 deg, Obermeyer 5 deg, and 308 match). Although not clearly stated, it appeared that these recommendations were specific to bolt guns.

Concerned (maybe incorrectly) that a semi-automatic will require a bit more clearance for reliable operation, I am hesitant to hang my hat on any of these recommendations. That said….Does anyone have experience with a similar build that can relate their achieved accuracy and/or a chamber/reamer recommendation?

Thank you

Note: Wasn/t sure where the best place to post this would be, so I also posted it in the Semi-Auto Forum.

 

[hero's machine]

Re: Need Chamber Recommendation For 308 AR Type Rifle

I have next to no experience with autos, but if you don't get the answer you seek....call kiff or manson and speak to them. You can get it right from the horses mouth.

 

[msalm]

Re: Need Chamber Recommendation For 308 AR Type Rifle

I talked to Kiff about that exact subject, and without reservation he told me the 308 Tactical Match reamer was the one I wanted so that's the one I used. It has worked very well so far in both AR10's and bolt guns.