Anyone happen to know if a 4 inch revolver (Colt Python and or Ruger Security Six) will fit in an apache hard shell case- case 2800 perhaps? or 3800 is smallest apache capable of sitting 4 inch revolver? (individually not together) and if that case will fit in a USPS flat rate box from experience? Also is it safe to ship a revolver barrel down inside the foam case, or best if laid sideways or doesn't matter since it's encased in foam?