I can only answer your question about slugs vs pellets. My Vet 2 tube with 700mm barrel is tuned to shoot slugs. Specifically, H&N HP .218 (25gr) @945fps. I have shot H&N FTT 14.66 gr (5.53mm or .218) head-size pellets and they are extremely accurate out of this unchoked CZ barrel. I have also...