Just to be on record "F" is the next bigger than "TT" it fits in just under 4 buck , the t's and f are a Euro thing .
I like 3's early in factoriesand 1's or B's late in handloads ducksand geese . I hunt a strange lake though white wing scoters , wigeons , red head , mallards , 3teal , shovlers , honkers , snows , swans , white fronts , several mergansers , woodies, pintail on any given day .