The Lupo is the same 22" 1in 11 twist and is meant to shoot the 178gn eldx extremely well, so I'm told anyway.....I will get some loaded eventually but I'm a little busy with other projects currently :cool:
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I'd run 155 TMK, 150 SST or 155 eld's in your situation with 2206h as its more available. at the moment getting primers is a mission though.
but for factory ammo its pretty hard to go past hornady 150sst Superformance, it has a bucket load of speed even out of shorter barrel rigs as a rule and has shot well for most rifles I've seen it in.
500m is a long way for a slow low BC .308 but its quite doable. if you can get out there and practice in the wind a bit.