Sounds like the days of 9mm MAJOR of 175. Before the 2011 style was widely available, there were all kinds of higher cap wonder 9s shooting some form of 9x21, etc. I was there - CZ75 Clones, Beretta 92s and clones, Browning HiPowers and clones, and yes early Glocks. 175PF 9mm hammered those pistols (and the early red dots). I had a Springfield Armory P9 (CZ75 Clone) in 9x21 with a Tasco ProPoint PDP3BD with an Awesome Dawson scope mount. It worked but took a real beating at 175. Class when the HiCap Caspians, Paras, and 2011s became available to load to 38 Super, 9x23, etc. length. PS - in my memory the Berettas and specifically BHPs did not survive in that service long.