Dont alter the size of your gas port if you intend to use heavy loads again. Years ago a friend kept breaking the action bar on his F grade 1100s. Got replaced multiple times. Last time at The Lordship Skeet shoot, back when it was in Connecticut, the smith noticed the gas ports were drilled out oversized. Too much gas, caused too much force on the action bar, which caused it to break. When the smith asked the owner who drilled the ports out he said he did, had to to get it to work light reloads was his reason. Got called a dumb ass for doing it. They sent the barrel back to the factory to fill in the holes and redrill them. Told the owner no free repairs ever again if he worked on his own stuff. They had to have the entire gun back to any free repairs.
Same fellow decided to port a D grade barrel. Did it on his drill press. Left the burrs in the barrel. Every time he shot it strands of plastic came out the ports. Powder stained them black each shot. Built up until the end of his barrel looked like it had public hairs coming out it. He was a hoot to shoot with.
