Ive been using nitros for about 10years or so I started out using hevi 4x5x7 the went to mega weight absolutely loved both of them, but like you said they don't make mega-weight anymore, I went back to the hevi shot. you will regret your your decision.. its about 10 of us guys around my little town who shoot them,none of us are displeased. I will tell you this we all shoot rhino choke tubes. we tried just about every choke made for 10ga. then we all ended up with rhinos .720, but that's just us. good luck God bless