Just clean the gun before firing. Pump shotguns do not have to be broken in. After cleaning it shoot all you want, and then just keep her clean after each range use. And then you dont even really have to clean her.
A semi-auto you should break in by shooting in the heavier loads, which will allow you to shoot the lighter loads without problems later.
The rifle break in is debatable because of the copper getting into the grooves of the rifled barrel. I still believe in just cleaning beforehand and then cleaning after shooting and just making sure to clean out all the copper good. After this it is broken in even with a precision rifle imo.
A semi-auto you should break in by shooting in the heavier loads, which will allow you to shoot the lighter loads without problems later.
The rifle break in is debatable because of the copper getting into the grooves of the rifled barrel. I still believe in just cleaning beforehand and then cleaning after shooting and just making sure to clean out all the copper good. After this it is broken in even with a precision rifle imo.