I went out to shoot a box of Factory Winchester 140gr ballistic tips in 7mm rem mag. in a Remington 700 SPS Stainless. The first round seemed hot but came right out with a little flattening of the primer, by the 7th round the case was stuck in the chamber and had to be tapped out with a cleaning rod. The primer is a little flat but I have noticed worse without the case sticking. Could it be a rough chamber? The case was scratched just ahead of the belt where it appeared it was stuck. I shot the rifle last week to fire lap the barrel, Tubb system, it was new, never shot when I did this. but none of those had any issues, 20 rounds. How would I check the the chamber, I assume gunsmith. Has anyone had any issues with this in this model, SPS Stainless?