Probably real good.
A lot depends on choke. Many manufactures are going to the Improved Cylinder choke for slug and buskshot, but the old standard was the Cylinder Bore.
Like slugs, you get the best results by buying a variety of brands and types of buckshot and shooting them for best patterns.
Just make sure you have a smooth, non-rifled bore, since rifled bores are for sabot slugs ONLY.