I finally had a chance to shoot some Fed 100 out of my G17 and this is what I found. The load was a 115grFMJ, 5.9-6.0 power pistol (max in my manual is 6.7 for 31,000psi) mixed brass, the fed 100's and some wolf SP.
First a started with a 4lb wolff striker spring (reduced) and a stock striker shot about 50rds and all went good at first glance of the brass, back to that in a min.
Next i tryed the wolf SP with same spring and shot till I had a FTF, that only took about 25rds.
Than I put the OEM spring back in and shot 30rds of the fed's again, and then looked at all the brass and had 4 primers that pierced and 2 were very evident with a big hole, you could see the side of the anvil.
So i stoped and put the 4lb spring back in and shot another 100rds with the fed SP and they all went BANG. I picked up all that brass and went home, later that night I looked at all of this brass closer (I kept it all separate) and out of 150 I found about 8 or 10 that had pierced with the light spring and stock striker. the head stamp of those were marked FEDERAL +p+/ SD 9x19/ a couple of R.P./ and 1 SPEER. the hole was not as big as those with the OEM spring but were blackened and did have a small needle size hole. The striker looks fine and is not damaged.
So in conclusion I think the FED's do pierce in a Glock, I'm not saying don't use them but if you do you will be better served with a reduced striker spring (got my pull to 3lbs with a (-) connector) and plan on changing your striker sooner with this set up. next I will try my .40 major loads as stated above trying different springs but I expect the same results, let me know if any one would like me to post my results.