Hi Bush..your "Couple behind front hand" is a bit vague,as some people hold Longer than others
The beginning of the forearm would indicate a slightly muzzle heavy balance.
Usually the Hinge Pin is a reference point, sometimes the Breech Face or Trigger(s).
Usually target guns will have the balance point 1 or perhaps as much as 2 inches forward of the hinge Pin.
But I'm no 'xpert, just have a couple of 71/2lb Pigeon Guns that are in that range
G'day n G'd luck
Franc
Someone who shoots trap will help more/ I'm sure