Im not criticizing your choices. I am offering an alternative viewpoint is all. The OP was asking about medium range engagements I believe and for this I tend to use the build I described. Iron gob, top level armour and the heavy barrel - tap firing at the head - I find is plenty to bring down your average marine. I havent factored in the golden gob because A) im at work and have no access to accurate numbers and B) I dont think i can fit it with the high end armour and dont want to spread misinformation.