Try using 230 bullets using a fast powder calibrated for the powerfactor of the steel you are shooting. My favorite "old" 175PF load for ipsc was 230lrn with 4.0 Clays, dropping down to around 3.8 now. With the larger diameter round you need to use the bigger bullets with faster powder for less "FELT or PERCEIVED" recoil impulse. Whereas with the smaller diameter bullets (ie. 9mm, 38super) you can shoot faster velocity with smaller bullets and faster recovery time. Your thought to go to 200gr bullets was correct. Give it a go. Remember you want your load to take the steel down with a partial hit, just in case! Have a good one! Do you shoot at West Liberty or down at the USPSA matches down at Lowell? DC