I had the same issue as varmitbob. Now I can't tell you for sure whether it was the switching to Remington ammo, or just spinning a wire brush in the chamber that fixed the sticking cases, but I know I've never had a Rem. case stick in my 308 Survivor.
The South African stuff shot great groups, just the sticking issue was driving we crazy, so I stopped using it. For the price, I might pick up a box and see if the brush fixed the issue.
RackWrangler