I use BH 209 in my wolf I have found 80 or 90 grains by volume seemed to work the best. I didn't see much difference in group sizes with either. I went with 80g by volume and a 250SST with Harvester SB sabot. Winchester w209 primers. I was the one who had the breech plug problem,CVA replaced it, I haven't had any problems again with the new one, but haven't shot any loads over 90 grains. Around 1 1/2" 5 shot groups at 100 yards with that set up. I really like my wolf. As stated here make sure you clean the end of the breech plug with a drill bit. Fouling really builds up in there. I'm pretty sure its the bit size just under 1/8" I think its 7/64".