Ok its been some time now that i have been searching and taking into account all sorts of things regarding heavy caliber rifles.

Finally i have found something which suits me, which i dont want to pass up.

Now, this is where i need urgent help;

Gun is marked 25 bore on the rifle side, its an old hammer cape gun. Other side is marked 13g but should just have been intended as 12g yet bored a bit too small?

Now, the chamber has been cast/checked as .577x3" express.......i thought 25 bores were usually snider or similar?

The firearm is being restored totally.

What im desperate to know is; can .25 be .577 express, i see it on this site and others as '20/577 or 20 bore/577' Is this due to nobody knowing what a 24/25 bore is in general, and so using 20 bore as all know what size this round is?

Is this the only 12g x .577 express cape made?!

Many thanks for all and any answers, i am lost......

Ben