Took my Remington 700 SPS Varminter in .223 out to the range yesterday. I loaded up the box magazine with some Remington UMC 45grHP and then cycled the bolt and stripped the first round into the chamber. I took my shot and then tried to open the bolt. It would rotate to a certain degree and then stop, not allowing me to continue shooting. I was eventually able to get the bolt open after dropping the floorplate and removing the remaining cartridges and using a FIRM upwards motion, almost like clearing a stuck Mosin Nagant bolt. Then I saw that the fired case was still stuck in the chamber and not coming out. The rifle has about 500 rounds through it and was freshly cleaned the day of the range trip and this is the first problem I have had with it. What has happened here and how do I go about fixing it? Thanks for any help you can give me.