I've owned 3 SKS rifles in the past, but haven't since 1996. :? I used to shoot the cheapest ammo I could find at my local shop and it all fired real nice. I just ordered a plastic stock for it too. The wooden one on it is a bit heavy and beat up pretty good.
I've never tried the Tiger ammo. Wolff is about all I've tried.
Go to http://sksboards.com/ those guys will have the poop on the different ammo. There's also lots of info on how to smooth out the triggers out there on the web. I've done the triggers on all of mine let me know when you get yours I'll walk you thru it.
I'm at Mom's house tonight, when I get home tomorrow I'll post some other good sites you can check out.
P.S. For what it's worth, I tried most of the russia ammo back about 9yrs ago (Tiger wasn't out back then). I really couldn't tell a whole hell of a lot of difference.