If you want to shoot the 600 yard steel targets at Angeles, a .223 and some bulk 55gr FMJ ammo will also do the trick just fine.
My only concern is that the OP did specify a "sniper rifle". To me, that means a rifle that an actual sniper will use. Since they are bolt actions, you can bring in actual sniper rifles even as labelled "sniper rifle". For some reason, some people are turned off by the term, but if that is what the manufacturer calls it, it is what it is. All the rifles I know of that are labelled and sold as "sniper rifles" cost quite a bit of money.
My only concern is that the OP did specify a "sniper rifle". To me, that means a rifle that an actual sniper will use. Since they are bolt actions, you can bring in actual sniper rifles even as labelled "sniper rifle". For some reason, some people are turned off by the term, but if that is what the manufacturer calls it, it is what it is. All the rifles I know of that are labelled and sold as "sniper rifles" cost quite a bit of money.

there is one for sale at collector exchange here


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