What choke is *T ?
The shotgun is made in Belgium.

* is probably full, at least it is on my browning invector chokes.

*T may be extra full turkey? Dunno.

You don't say what style your shotgun is but * is the normal symbol for full choke and the T could be for "Trap". Extra full chokes are made for Trap use.

If a sporting gun then the T could well be for "Turkey", for which extra full chokes are also made.

It is a Belgium made SxS 10 gauge with double trigger. It is stamped on the receiver *T.

Doesn't matter! You still have to pattern every load . You may get a surprise !!

I can only shoot steel and non-toxic shot for waterfowl here in USA. It would be unwise if it were a full choked barrel.
I don't care to spend money on Bismuth shot.

For example ---Benelli M 1 90 ,12 Ga , MOD choke ,BB steel shot--- Extra,Extra full pattern !!!
Tighter than Turkey choke !

If it is extra full turkey and you want to shoot steel polish it out to something more open.