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Hey ncboiler, if you don't mind me asking, why do you GRX and then run through a Udie? That seems like overkill unless I'm missing something. I am back and forth between the two options but never considered using both. I plan to wait until I get my gun to see what will and won't chamber before committing either.
I do it because I'm OCD
Partially kidding..... I do it because it gives me a chance to inspect the brass, mostly for headstamps to weed out the NT brass. I used to do the U die on a single stage and I had a few pieces of brass that were basically "squished" for a lack of a better term.... the glock belly became worse. I bought the U die first but wanted to try the carbide version of the GrX. The GrX is much faster in the single stage press than the U die.
I haven't had a round fail the case gauge after using the U die so I continue to use it. Also there is less stress on the press handle after running the brass thru the GrX die before the U die.
I load the S&B brass as well. Yes the primer pockets are tighter but the primers will go in, just have to finesse it a little