Not a rifle I know but I taught tactical shotgun for my former agency and teach it for my current employer. A well practiced lefty can usually beat a well practiced right handed shooter using an 870 on ejection port loads from the side saddle. For a lefty keeping a firing grip and pointed in, it's a little faster and simpler movement to pluck a round from the side saddle and drop it in the open action.
I always have to stop and think my way through the right handed operation of the 870. Most of the students are right handed so I have to teach from that side. Makes me slow down and think about each operation, which is good for the students.
Still would never give up my left handed bolt rifles.
