Im sure rifled chokes would help a 410 slug. loading the brass cases to the max that the gun is safe with would also increase performace. Howevwer the original intent Of my idea was to rebarrel with a .41 rifled barrel or what ever bore that a Rifle bullet would fit into and make it a rifle not a shot gun. My thinking was stock mags but made into a rifle with the bullet sticking out of the case like a normal rifle round. standard shotgun slug rounds with the slug seted past flush will likely use up to much case capacity for what IM thinking.