I have the His plug and brass modules. the reason I backed all the way down to 51 gr. is I was having accuracy problems and couldnt figure it out so I was willing to try different things. now that I shot a great group after securing my forearm stock so it won't move, I will start moving up towards 55-56 gr 4198 and a fury 225 and 250 at 40 cal saboted and see if i'm still getting good accuracy. I may end up as high as 57 gr. 4198. and I may very well get a DI plug too, but I got the HIS because Hankin's had these guns already made up and my hands are practically destroyed by a nerve disease and it is very very hard for me to just tie my shoes so I was thinking let me try the His plug first and maybe get a Di plug later to play with. I agree I need to move up in ballistics at the range I'm likely to encounter a shot being as I hunt bean fields and cut corn fields. will probably go back through some .452 bullets also now that I seem to have found my accuracy problem. ya'll thanks so much for the insight on this, being a beginner in this SML thing ya'll have really helped me. If any of ya'll have accuracy problems with a cva conversion break action gun, be sure to check that fore end for any play or shifting, there was a little adjustment under that front stock that tightened it right up for me.