Yugo SKS - fairly accurate, but I've never tried grouping with it.
-Can I use the same targets used to zero m16's, or will the different trajectory of the 7.62 x 39 matter?
-Do I need to buy a site adjustment tool, or can I use a nail/pliers/whatever?
Any helpful advice is more than welcome, thanks!
you can use a cardboard box to zero it , it doesn't mater
but the site adjustment tools are worth it.