Quick,
Your right, about the federal 7's. I've just had more success with the Hevi 13 in the past. Plus the federal 7's are 15g per cubic centimeter and the hevi 13 is 13g per cubic centimeter, so you getting more pellets per ounce with the hevi-13, around 280 pellets in the federal 1 1/2 oz load and around 317 pellets in a 1 1/4 oz hevi 13 load.
also i have found the federal flitecontrol wad to be a little more finicky concerning choke tube selection then the hevi 13 wad, this is all just my personal experience, as you know every gun shoots different.
thanks Zack