A different, interesting style, of 12ga slug, from Russia.
First picture loaded round, in plastic, roll crimped.
Second, two types of slugs they have on the same base.
Base for rifled barrel,  little smaller diameter than the front. 
Looks like the roll crimp locks against
the edge of the base. Neat idea, and it could have a
flat meplat slug on the  front of the base like 
the US-S brass slugs fron Greece are on the 
plastic bases that I have here. They must use a crimping
die with a deep hollow up in the middle. We have thought
of taking a roll crimper and putting a deeper recess
in middle to load longer nose  slugs further out so as to
have more room for our slower powders.ED