I'm looking for feedback on what 38 spl loads work well in Speed Six, 4", I'm currently using HP-38. 4.0 grains. with a 158 LSWC ( Missouri Bullet Co). I can't seem to get consistent groups. I'm thinking about trying 3.8 grains w/ 158 LRN. Any suggestions/feedback would be greatly appreciated. Thank yo for your time and expertise.