I have had a HK91 for some years now so I will try to be objective. The PTR 91's are great guns. The are the AK of the 7.62X51 battle rifle world. Arguably some would say the FN/FAL is though.
These guns will feed and eject anything. I do believe that they have a fluted chamber like the HK91's do also. The brass coming outta mine is somewhat reloadable........if you can find it. My brass comes out super fast,with a loud "PING" and it is just a blur. The good part is........if you are firing from the same position it is usually in a 3' circle.
As stated above,these are heavy guns. Somewhat short and blocky feeling. After you've had on for awhile and taken it apart several times you will grow to be in awe of the designer. The mechanics are absolutely brilliant.
I have all the accessories with mine. Back in the day you could actually meander through Quality Parts,(which later became Bushmaster)when they were down in Portland, Maine,and pick the stuff you wanted that was in bins and go checkout at the front desk. You could also find parts for AR's,AK,s,FN's,and stuff to build a combat type shotgun. And this was before the term "TACTICAL" was added to everything form scopes to socks.
If you want a sturdy,shoot anything,combat accurate 7.62, grab up one of these. For hogs at the close to med-close ranges, these guns would be great. ---- pruhdlr