loboslanding said:Not to be contradictory, but headspace on a 1919 is defined as the distance between the face of the bolt and the rear of the barrel.
loboslanding said:If a shooter has to go more than 4 or 5 clicks then they need to find out why. If too much brass is sticking out the rear then the thickened base is out of the chamber and there is not enough support for the case when ignited and blowouts are eminent.
Don't keep turning the headspace out if the barrel is that far out of spec. We have had numerous rear case separations and I suspect that this is one reason why. Don't compensate for a shallow chamber by increasing headspace; bad ju ju.
Headspace is still defined as the distance from the bolt face to the rear of the barrel...if you have to use any other definition than this then toss the barrel or get it reamed properly. Setting headspace with micrometers instead of counting maximum clicks can have too much brass exposed.