FWIW, without a case in the ram, bring the handle down, ths raising the ram, and screw the sizing die down firmly onto the shell holder. Now lube a case lightly and run it in. With the ram fully up and holding pressure on the handle, look to see if now you have a gap between the shell holder and die bottom. Sometimes your rig will have enough spring in it to not really fully resize. If this is your situation, you need to keep slightly adjusting the die down, on a new to resize case, until you get just get rid of the gap.
Then wipe the lube off and try chambering up. They should fit.
When you reload them, try fit again as mentioned previously. Maybe you used a reloading manual for an OAL? If they dont fit the OAL is too long for the ojive of the bullet you are using. This is normal to tweak. Turn the seating stem in bit by bit until it chambers up, then maybe just a tad more to be sure. Do about 5 this way, step by step, checking as you go, tweaking if neccessary, until you are confident you have the fitting combination, then lock the rings down, take some notes (you have a reloading notebook, right?) and stuff some more up, checking periodically that they chamber up, and you're good to go.