Personally, I rely on the case gague.....not barrels in a variety of my guns...then I know its right. I case gague every round - as I box them up ....and once in a while, I find a finished round with a little crack that opened up as the bullet was seated --- or a burr on the base rim of the case...and it sticks going in or out of the case gague / and I reject it - and pull that bullet ....and reuse the bullet and the powder out of the case ( and trash the case ).
If you don't have a final crimp die ...yes, I would get one.
I reloaded about 1,000 rds of 9mm this morning ...( all from swept up brass at my local range ) ...and I rejected 3 rounds...( 1 for a crack / 2 for burrs on the base rim of the case)...
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