I have a BT 100 with an Invector Plus choke tube marked "LF" (Light Full?). I can find no charts giving the constriction of this choke. The tube is not flush but is only extended about 3/8" to 1/2" and maybe it isn't a Browning tube. Anything longer than this tube will not fit in the Browning gun case. I'm assuming it would be Mod, Improved Mod, Light Full and Full in the line of constriction but can't find any verification of that. Can anyone help with the constriction of this tube?
Don in PA