Hey Guys Im new to this site.
I bought a new savage .308 and bought a pack of Bullets 130gram America eagle.
My Questions .
1, What is your preferred amp Brand for accuracy .
2, Where would be the best place to buy amo in bulk at a good price in Sydney or if interstate at the right price with postage is fine as well.
3, what is your preferred Bullet weight , is 130 gram enough to take down Big game.

Only you can find out which one works best for your firearm. I suggest buying a few brands, go to the range, and shoot them. Then buy the one that shoots best out of your gun.

A 130 grain bullet is a bit light for a .308 and big game.

What Grain would you suggest

What kind of big game are you talking about. A 130 gr bullet in 30 cal is not, IMO, an ideal "big game" bullet. You'd be much better served with a bullet in the 150 - 180 gr range.