I reload 308 for my G3 all the time. Reloads are all i shoot in it. And the kicker is.....Most of the brass that ive reloaded 4-6 times for my G3 is the indian OFV 74, that shot great the first time i shot it i might add. Yes, it mangles the brass, the necks and mouth get really smashed sometimes, but a neck expanding by running them into a 7.7jap neck die then the 308 full size at least twice with a lot of case sizing lube. No cases have ever failed on me.
The only cases that i will not reload are ones that get kind of "crimped" about roughly at the halfway point, as no ammount of working with the dies and nothing short of fire forming with corn meal will blow that out, as i dont have anything without a fluted chamber the only fire forming i do is with fully loaded rounds. so i toss the ones that crimp in half really bad. I do not know what makes a small ammount of the brass crimp that badly and some not even contact whatever it is that seems to hit the others and screw them up. I dont own a saigia 308, but i have been reloading screwey 308 brass for a long time. As i said i do not have anything but fluted chambers in this caliber so i dont have any other basis.