After three months, I finally got to the range yesterday to shoot my gp100. When I bought it I also bought a couple boxes of American Eagle 38 special to plink with.I bought the gun used in excellent condition and assume it's been sighted in, but maybe not. Anyway, at 25yds the gun shoots about 2" left and 3" down. I'm going to pick up some .357 rounds this week. What should I expect ? I really did not want to touch the sights till I ran some .357s thru it. Likely the higher performance rounds will raise the impact point a couple of inches ?