Ok, here we go, a friend has brought me his 6.5 Grendel that he can't seem to get shooting any better than 1 1/2 at 100 yrds!! The loads that are posted on some of the forums, along suggested loads from the manuals, with accuracy of 3/4 inch or less will absolutely not shoot in this rifle!! The barrel is a Stoner 1-8 twist 5R 18 inch SS. The assembly seems to be in good shape!! Have ask him to bring me some of the same loads he has been trying to see if I shoot any differently!! Results seem to be the same!( ya I know that doesn't mean much!!LOL) The fired brass has carbon residue on every fired case about half way back the brass! Compounded by FTF of one in 5-6 rounds fired!! With the carbon on the brass and the FTF one would think that the chamber pressure was lacking, but the loads used are all at the higher end of the suggested loads! The heads space checks as it should!!
Now for some of the findings. When cleaning the barrel I find a loose area about an inch ahead of the gas block opening, the patch becomes loose as it passes that area then tightens again, then about the last inch and a half of the barrel the patch becomes much tighter than the rest of the barrel making one think the barrel is choked!
Thoughts: the loose area maybe contributing to the carbon issue due to chamber pressure drop, as the gas fills the loose area, and may also contribute to the FTF issue!! The choking of the last portion of the barrel may be effecting the accuracy!!
YOUR THOUGHTS????
Now for some of the findings. When cleaning the barrel I find a loose area about an inch ahead of the gas block opening, the patch becomes loose as it passes that area then tightens again, then about the last inch and a half of the barrel the patch becomes much tighter than the rest of the barrel making one think the barrel is choked!
Thoughts: the loose area maybe contributing to the carbon issue due to chamber pressure drop, as the gas fills the loose area, and may also contribute to the FTF issue!! The choking of the last portion of the barrel may be effecting the accuracy!!
YOUR THOUGHTS????
Comment