Aggie, It appears that you may have lowered you bullet seating die farther into your press instead of just lowering your bullet seating plug???
This would crush your cases. It does decrease your OAL but sure makes chambering difficult and accuracy would suck. A bit of sarcasm there. Don't try to chamber or fire these rounds. Pull the bullets, dump the powder and throw the brass away. There is no way you can bring these cases back to normal.
Ok here's what to do. With the proper shell holder in your press, and the ram in its highest position, run your sizing die into the press until it contacts the ram. Lower your ram and turn your die in 1/4 turn.
After you have a properly sized case, put it in ur press and run it up to its highest position.Back out your seating plug and screw your die into the press until you feel it contactingthe case mouth and back it off a little.
Now, slide a bullet of your choice into the case mouth and run it into your press/bullet seating die. Keep screwing in your seatin plug (not the die) until you have the OAL you desire and lock everything in.
BTW, if your initial OAL chambered easily into your rifle and fit into your magazine, why did you want to change it?