I have been reading that the 3-7 has some rather nasty fouling tendancies. Still require the cleaning between shots, caking and hard load of 2nd and 3rd rounds. Guys even noticing the rod not going back to same mark (residue build-up) I stuck with the cleanshot and the powerbelts, no problem. The plus I have read is that the 3-7 eeks out a bit more velocity with like weight over the cleanshot. Has this been your experience as well