cheers mate every day is a school day, if your slugs are heavy I find the flat bands are better straight cut I use 30mm straight cut for stones pebbles and bigger ammo, and taper them for small ammo, it seems to travel much faster, my current set up is 25mm to 15mm singles and with the 9.5 steel they really fly, not really a fan of double and treble bands seems a bit gimmicky to me and just more to tangle,if I want to fire bigger ammo straight cut 30mm acts very simular to tubes there spot on mate I've killed loads with them an free so I'm not wasting money I do but the odd few hundred 9.5bb n