DarthNul the MFS brass is very good reloadable brass I have some form a few boxes I bough at Cabala's back during the summer when it was on sale for $6 a box most of mine is either Win. or Prvi Partizan,I've reload the 7.62 x 39 for over five years with excellent results.
You can get some once fired Rem. here
http://www.bluestarbrass.com/catalog/ofrbrass.htm I don't know if it uses SR or LR primers,I would suspect the majority of it is SR although Rem. now produces there X39 ammo with LR primers. You can get new Prvi brass for $31 per 100 here
http://www.buffaloarms.com/browse.cfm/4,7814.html it use LR primers. If you going to load X39 read these two post.
http://www.sksboards.com/smf/index.php?topic=56422.0
http://www.sksboards.com/smf/index.php?topic=30961.0
Evidently some SKS rifle are rougher on brass than other,I have yet to have to toss a case that has been shot in my Yugo or Chinese I have anywhere from five to seven loading on most of a couple hundred pieces and a few hundred pieces of new Lapua & Prvi brass in reserve.
One way you can reduce brass loss is to shoot reduced charge cast bullet loads I use 12.5 grs. of Alliant 2400 behind a Lee 160 gr. tumble lube gas check cast bullet,muzzled velocity is around 1500 fps. and brass drops right at your feet. 50 yds . groups in the Yugo run 3/4" and under on the Chinese same load shoot five shot groups you can cover with a nickel. The cast load run me around 10 cents each.
You can also take an extra gas tube and modify it by drilling three extra small holes to vent of excess pressure in the gas tube before it even starts affecting the gas piston which in turn will slow down the cycling speed of the SKS bolt and drop your brass within a few feet of your shooting position. It want affect the MV of your loaded rd. and you can tune the cycling action by the size of the holes you drill.
http://www.sksboards.com/smf/index.php?topic=41391.0