djb, PM sent on mag mod. Also, I'm interested in your quote below regarding the bedding and screw tightening. I'm a bit confused as to whether you did it on the 220 and it didn't work, or are you referring to another gun?
Thanks.

BTW, I learned that my gun definitely shoots best tightening both front and rear action screws fairly tight. I went through lots of cash trying to find an accurate load before I discovered this. I bedded mine and treated it the same as my rifles; tighten the front screw firm and just snug the rear. This did NOT work on my 220.