This is a new experience for me. After the 4th or 5th reloading this lot of brass, the primers just fell out.
This AR10, is the only 308 I have, the brass is Federal match brass, the primers are Winchester, the powder is IMR 4064, the bullet is a 168 grain FMJ BT. The powder charge was 41.5 grains, very conservative by Sierra's manual.
Is this standard for ammo being used in a semi auto? Most odd with my other bottle necked cases the neck split first.
Jim

The brass held up pretty well in my AR-10T, but in my AR-10A4 the chamber is more generous. Those I only run through the gun for 4 firing cycles, then pitch. I never tried to get more than 4 cycles out of my M1A. For plinking these days I usually find some milsurp Berdan primed stuff by the case and leave it at the range.
Some of the really old bastards on this forum can render a more informed (i.e. much more experienced) opinion than I, but I believe the brass just goes through a much wider range of dimensions during its firing-resizing cycles in most semi-automatic rifles.
lawndart

I don't have a .308 semiauto but in my 5.56 AR's the Federal brass is bad about dropping primers with loads that worked just fine in Lake City or Winchester brass. I do use Federal .308 in my bolt guns and it seems softer than other brands.

But I get the best accuracy from loads using Federal brass, so I just use it three or four times and then pitch it.

I'd try using a different brand of brass in your AR-10 to see what happens.

hth