ORIGINAL: cherokee_outfitters
Absolutey no way unless the gun is damaged or you have seriously overloaded your cartridge will they commonly show signs of pressure. They have almost a zero tolerance of any parts that will give enough to show ejection marks or blowed back primers. When the falling block comes up it sits right on the case head theres no where for the case to move. It is to this day the strongest action in the world. You can overload that gun to the point of serious barrel damage.
But if you got blown back primers then your load it too hot. If you have ejection marks on that rifle then you may need to see a gunsmith because they don't move enough to allow that to happen. In centerfire cartridge's the Ruger No 1 rifles is all I own.
Do you have a 6mm from this era?? 1972
The fired case ejects easily with NO ejector marks.
The primers are slightly flattened but have now smoke whatsoever in the pocket or around the primer. The firing pin is NOT cratered or pierced either...
Like you said "this is one of the strongest actions" so if it was "overloaded" at some point enough to stretch the chamber, the rifle would still be in pieces.
This fact leads me to believe this rifle has ALWAYS been like this...slightly oversized chamber from the factory.
Like I said before...the SAAMI specs I have are .470 at the base of the cartridge. My factory ammo measures .466. My fired cases are measuring .474. If the factory brass was actually .470(like it should be) then I would not be having any problems.
I will take it to a gunsmith and have a chamber cast done to confirm slighty oversized chamber.
I am pretty sure my problem can be solved by getting some brass that is actually .470 at the base. Firing a reduced load to form the brass and than neck sized from there.
I can get some custom FL resizing dies from Hornady that will be at the the right spec for my chamber...so when I eventually have to resize the case body I do not squeeze it back too much.
Just as a matter of coincidence I measured some of my range brass I collected over the years and I did run across the odd case that had expaned the same amount at the base. (.008). Obvioulsy it was factory ammo as most who reload collect their brass not discard it...
