First off , if you want your gun bore-sighted corretly , do it yourself. My local gun shop attempted to and it took me 3 boxes of slugs to get it right. Used the winchester platinums and Hornaday XTP ' s. Was right on at 75 yrds and about 2 in low at 100. Was looking for a more accurate slug. Just bought some lightfields last night and gonna try em today. Any suggestions on slugs ? Do you really lose that much speed between the 2 3/4 vs the 3" ?