Hello GT, Im new here, first post and all, and am about to go do some swapping around for my first glock. Now before everyone starts reminiscing about their first glock purchase I would greatly appreciate it is you would help me out. A friend gave me about 2500 155gr. 40 bullets and I was wondering about the POI as compared to the POA with the standard glock sights would be with this particlular grain bullet. I know usually people would just shoot what weight shot the closest but I guess I'm doing things backwards. Again I greatly appreciate any and all responses and and pretty excited about getting a Glock. Thank you again, Duffman07 P.S. By the way, I mainly shoot at 25 yards, and am looking real hard at the G23, it just seems like the perfect size to me.