When I did mine I gapped the ground electrode with a needle nose, staying away from the post side. I figured the plating on them is probably pretty thin, so they probably wouldn't take well to tool contact.
Even pre-gapped plugs can be out of spec just from bouncing around during shipping, unless they put one of those cardboard sheaths over the electrodes, which I haven't seen in a while.
NGK has the cardboard condom over the tips :-)
2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned
04 GTO - sold