Casting or pp for the 303 as bagheera says is not for the faint hearted. If yours is a 2 groove I'd forget the idea. I disagree on the 7.62x39 point though. I have been using the barnaul ones in a long branch, a p14, and martini enfield carbine all with good accuracy to 250 metres possibly more but thats as far as ive shot out too. Outstanding as a goat culler, my preferred powder is 2206h.
In the 308 either 2206h or 2208 are good powders. Sierra gamekings in either 150 or 165 grains are good as either target or hunting rounds and using the one type keeps things simple. Out to 500 m i cant think of any advantage a heavier target type pill would give unless you want to shoot to 1000 m and like recoil.
Just saw wallabys, you can get light 110 125 gr projectiles for 308, while not much good at long range out to 200 + they are good for hares, wallabies etc and expand on little targets.
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