Quote Originally Posted by jmoore View Post
How to manufacture an "out of round" chamber??? A two flute "reamer" may produce a tri-lobal hole, A single point tool can possibly produce an elliptical hole. (Basically, the number of lobes is equal to the number of cutting edges plus one.) The typical reamer hes anywhere from 6 to 8 cutting edges, so making a measurably out of round chamber is HUGELY unlikely! The same for "banana shaped" chambers- reamers don't bend- they either break or make an enlarged entry zone...

Crazy stuff!
How do these eggspurts know their chambers are "out of round"? They look at their fired cases and they see uneven expansion at the base.

They haven't figured out that cartridges do not self-center in chambers that are slightly oversize - and oversize for a reason: to allow the rifle to operate with war-time quality ammo and dirty, often wet ammo at that.