Are you talking about your Shield or your Glock when it comes to the bulge? The Glock is well known for the "Glock Bulge". I reload "range brass" - once in a while will come across it. It resizes just fine in the FL die - I just reload it and shoot. I loose a good quantity of my brass at the range so that's why I use "range brass" - I have a bunch that I got for about 2 cents a casing - it doesn't hurt so much that way.
If you're talking a bulge out of your Shield - can't address that as I just got mine. 99% of what mine will eat are reloads/cast bullets. Ether 115 gr or 120 ish gr. out of Lee or Lyman molds.
The only other 9mm that I have is a SR9. That too eats 99% reloads from "range brass" and lead cast. I primarily use Bulls Eye or Red Dot - using data from the 3rd edition of Lyman Cast Bullet Handbook. I work up my loads as with any load - start at minimum and work up. I'm loading mid-range to a little lower on the loading data (min./max.) and the SR9 cycles just fine without a flaw. I don't like to load "hot" - there's no reason to.
As far as shooting "re-loads" . . . I will not reload for anyone but myself nor would I shoot any reloads done by others. I want to know what I'm putting in my chambers. There is nothing wrong with shooting reloads as long s it is loaded according to the proper load data. Personally, I have no desire to shoot + P ammo. For the type of shooting I do, a good basic round loaded within proper data does the job just fine.