If you are not using a separate taper crimip die (which I also highly recommend) make sure the diameter at the end of the loaded case conforms with reloading data. My Speer manual says it should be 0.4730 inches. You need to have a dial caliper to check it.
For the taper crimp die, the same procedure is accomplished but for a quick setting, lossen the die and insert a factory round. Then tighten the taper die until the round is snug. Remove the round and tighten slightly.
Hope this helps, Mikey
When Guns Are Outlawed, I Will Be Another One Of The Quarter Million Violators Who Are Not Prosecuted