No, the port could be opened but I use Remington Game Load hulls or 2 1/2" hulls, problem solved.

The 2 9/16 original hull is shorter than the 2 3/4 current hull and will catch on the port.
This is a diagonal measurement from the left side of the rim to the right side of the tip of the fired hull.

The Rem hull will work as it is shorter.

I have so many 16 gauge guns that I can be selective on ammo and gun.

Mike

p.s. To answer your question, only the port needs to be lengthened.