04-05-2014, 02:46 AM
I have a PTG throat Unithroat reamer I bought to extend the throat of my 6.5 CSS chamber. I bought it before the throat dimensions for the Grendel were readily available so it is not a compound throat reamer. It worked very well however the break in period for the rifle after reaming took quite a bit of time. At its best, the barrel shot 1/2" groups with 123 grain nosler CCs or Hornady SSTs regularly. 31.7 grains of LVR gives slightly over 2600 fps out of the 22 inch tube. I recommend the product but proceed with caution.