iqbal,

Not to jump into your question, but I have hunted N. America sheep with a 30-06 and 165 gr boat tail bullets. It works quite well out to 300 yards. I have also used the 308 a bit in a Valmet 12/308 combo gun I once had.

With handloads I could almost duplicate 30-06 ballistics, but not quite. Even with factory loadings, the 308 performed well to 300 yards. I don't know how your 308 ammo will be loaded, but think it a decent sheep caliber.

I know two avid N. American sheep hunters who use the 308 exclusively in ultra light rifles. These guys live for sheep hunting! Both load 165 gr flat base bullets. Bigger bullets and boat tails tend to seat too deep in the case with that 308's short neck.

I hope this is some value to you, my friend.