Cody,
Not that it makes all that much difference, but are you reloading all the same brand brass? If not, I'd separate them by manufacturer. Also, did you check and measure the length of your brass so it is all the same? If so and you still get that hard closing bolt, as has already been suggested, try turning in your die 1/8th of a turn and see if that corrects the problem. I don't know if you started with new brass or previously reloaded brass and if you know how many times it had been reloaded. Full Length sizing will "bump" the shoulders which is most likely causing your condition. Good luck and have fun.