Not as long as he didn't use his super-full turkey choke. While the fosters-type rifled slugs are very under bore size, I still wouldn't want to risk shoving it through a very tight turkey choke at around 1500 fps. Modified or improved cylinder works best with rifled slugs. For sabots he might want to look for a rifled screw in choke, designed for slugs. I know Mossberg makes purpose-built slug barrels that can be had pretty cheap and you can find used ones on the net super cheap.