Ive been playing with SG on high like 90% of the time for a while now, although I mostly play with delta so playstyle may vary. I would recommend standard ammo and use recoil compensation. Don't forget to slap a rail light on because despite your vision as SG it helps out people nearby. At least try a bfa once and see how you like it, I'm personally a big fan. I don't think you can justify the bc on it but to each their own. Otherwise just remember to stay behind your squad, bring as much ammo as you can, and have fun shooting thousands of rounds
Goosen Dagen-casual marine