ORIGINAL: stalkingbear
We could guess all we want and we'd still be no closer to knowing exactly the truth for YOUR particular barrel/choke tube/slug. The ONLY way of knowing for sure is to shoot different slugs from a bench and find out how they group.
This is absolutely correct.
However, as a
general rule, a rifled barrel will shoot better than a rifled choke tube, because the slug gets started with a spin and does not need to get started spinning after slamming into the rifled part at nearly muzzle velocities. Some rifled choke tubes have been exceptionally accurate, and some have been just the opposite.