Not sure if the breech design for your rifle follows the "Blue Ridge Hunter", which is an Italian copy of the Hatfield rifle, which was an American copy of the "Blue Ridge Hunter".
You can tell by running a range rod with a cleaning jag, (but no patch) down the barrel and marking the rod with a piece of tape. Then, lay the ramrod along the left side the barrel, and see if the jag stops at the vent location or sits a couple of inches above the vent (rifle vertical).
If the jag on the ramrod sits adjacent to the vent, your worries are over.
If the jag sits about 2" higher, you have an "Uh Oh" rifle breech design. Pedersoli, on the B.R.H., utilized a breech plug with lonnnnng threads, about an inch or more into the barrel. The vent liner is threaded into both the barrel & the breech plug threads. The breechplug is bored out to about the dimensions of a .22 caliber brush, which, if that is the case, you will want to have one to clear the fouling out of the antechamber when it stops functioning.
If you ever have to remove the breech plug, you would want to remove the vent liner first. Otherwise, you will shear the vent liner in half (lengthwise). Don't ask me how I know that.
All the best on having the right breech design. it can be exasperating if you have the "Uh Oh" design.