just a little update for RWS shotgun slugs. you will find that RWS is offering now another slug line beside the original brenneke slug called Exact Slug in 12,16, 20 and 12 and 20 ga magnum
http://www.rws-munition.de/de/produkte/schrotpatronen/extra-line/exact.html

this nothing more than the italien made gulandi slug
http://www.gualandi.it/ENG/p_28_proiet.asp