I knew a couple of guys that used to get good results out of the Russian Tigr semi-autos. They are made by Izhmash and might be worth a look. I know they were hitting 1 liter bottles at 500, but I'm also pretty sure they did some work on the guns to get them to do it. I shoot a Russian Saiga built by the same company. It is a carbine model chambered for .223. It shoots pretty good groups out to 200, but after that it gets a little wild even with the good ammo. I'm sure if I had some work done to it, I could get smaller groups, but I don't hunt where I can see 300 yards, much less take a shot that long, so it works. If you are a real stickler for accuracy, bolt action or single shot is the way to go.