I dont think that Amsteel would be a good use here. Read somewhere that the pinch stress was not good for the rope. At any rate Amsteel is very strong nautical rope. You can use as small as 7/64 and be safe. Look up whoopie slings on youtube or on here to see how most use it. And one of the good places to get it is http://www.reddenmarine.com/rope-cor...teel-blue.html.