02-10-2014, 06:16 PM
That mark is coming from something during a rotational movement of the cartridge, it appears, probably from the barrel extension, but I would have to have it in hand to tell. You need to keep it from contacting the extension during insertion and extraction.
Don't use a magazine. Drop the cartridge into the chamber. Carefully close the bolt on it.
Extract it while keeping your index or pinky finger in the ejection port so the ejector can't push it into the extension teeth. Let it fall from the action, then inspect.
Here is the other thread: http://www.65grendel.com/forum/showthrea...#post86529
He definitely is seeing excessive pressure signs when firing the rifle:
![[Image: attachment.php?attachmentid=4529&d=1391605814]](http://www.65grendel.com/forum/attachment.php?attachmentid=4529&d=1391605814)
Don't use a magazine. Drop the cartridge into the chamber. Carefully close the bolt on it.
Extract it while keeping your index or pinky finger in the ejection port so the ejector can't push it into the extension teeth. Let it fall from the action, then inspect.
Here is the other thread: http://www.65grendel.com/forum/showthrea...#post86529
He definitely is seeing excessive pressure signs when firing the rifle: