Absolutely! Improved Cylinder is an excellent choice.
I am assuming that you are shooting standard Foster-type soft lead full diameter slugs, and not the fancy and expensive sabot-slugs which shoot a smaller caliber bullet enclosed within a plastic sabot. They are intended to be fired thru dedicated fully-rifled slug barrels.
BTW, almost all soft lead foster "rifled" slugs are considered safe in most full-choke barrels.
Hint: Don't shoot from a sandbagged bench rest. Stand or kneel and leaning slightly forward, and let the recoil gently rock you back slightly.