I use Dillon RL550B's and without changing priming (I don't prime on the press) it takes less than 3 minutes to change calibers.
Pull two pins and remove the tool head.
I loosen the set screw and remove the shoulder bolt securing the shell plate, drop the new shell plate in, adjust the shoulder bolt and tighten the set screw.
Slide the new tool head into place and replace the two pins.
Ready to load the next caliber. Takes less time to do than to write about it.