are you supposed to shoot rifled slugs through a rifled barrel or does it not matter? thanks in advance.

Dont do it accuracy will be all jacked up

My buddy does. It's only as acurate as me shooting them through a non rifled Remington Barrel.

You're suppose to shoot Sabots. The more expensive ones.

sabots are for rifled barrels. If you shoot anything else in them , your accuracy will suck and you'll be scraping lead out of teh rifliling forever. Rifled ( foster ) slugs = smoothbore , sabots = rifled barrel. However , lightfield makes a Hybrid slug that you can use in a smoothbore ....its the EXP