I recently switched from 158 grain LSWC lead bullets to Xtreme Bullets 158 grain plated LSWC. I have been told to use the lead data, but bump it a bit. I used to load 3.4 grains of HP38 with the lead bullets. I now load 3.6 with the plated. Max load is 3.8, so I’m still below max. I don’t have a chronograph but I’m just punching paper and the 18 I have shot (I’m still using up the lead ones) have been good enough for me.