If you are not planing on reloading the brass it can be shot as is. Though the brass will be trash afterwards. You will see a shining ring around the case head about a half to three quarters on an inch above the rim. If you plan on reloading the brass you can get some rubber plumbing washers. (O-Rings) Place them on the case up to the rim. It will take a slight effort to close the bolt. After firing set a full length sizing die to just barely kiss the shoulder, or use a neck sizing die. You will get about 3 to 5 reloads before they need to be full length resized, and fired with the washer again if the primer pockets are not loose.
The gun is shooter grade condition.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.