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I would seriously go 50 cal mini ball …. they have rifles that shoot that at over 800 fps.. will take down large game and can be hand pumped or you can have some tanks of air and a compressor.. you cna make 50 cal mini ball from a mold very easy..

http://quackenbushairguns.com/ hard to get but nothing says you can make one from an sks…

or this article has a few choices … notice the old one from lewis and clark expedition…. past the laws on copyright…