I had a Beretta Xtrema shotgun I bought for turkey hunting. After shooting a box of turkey loads I determined that the amount of recoil was beyond what I was willing to tolerate. I sent my shotgun off to Angle Port where they back bored it and angle ported it. It didn't make any difference that I could tell.
Shoot some of the Federal Flight Control ammo through a ported barrel or a ported choke. The porting rips the [bleep] out of the wads and royally screws up the patterns.
