I know F.B.I used to shoot lighter 10mm 180 grain loads, due to the lack of a good 10mm pistol. This was before the Glock 20 was introduced. They used the lighter load to avoid damaging the 10mm handguns available at the time. There is a really good article in the 2007 Glock Annual, titled " Glock's Perfect 10". I have shot 180 grain .40 in my G. 27 on several occasions with no problems. Except on one trip to the range, my friend was shooting my 27
with 180 grain rounds. About to clips in the after market plug for the gap on the bottom of the grip fell out. I told my friend he broke my Glock, and it was
not a fixable part. He got a distressed look in his face, and offered to go down to the gun shop below the range and buy me a new Glock. I laughed and put the plug back in. He looked very relieved, and used a few choice words. I thanked him for being a good friend, and we shot another 100 rounds. That's about the only 180 grain .40 issue I have ever had : )