I had the same problem occur last year when I took my 300wm to Aussie, the rail screws worked loose, luckily it was on my last day of shooting.
When I got back to NZ I torqued them up and one screw snapped off.
Repetitive shooting with 10 shot mags and a hot barrel wouldn't have helped. When you get onto mobs of Donkeys and Horse's the brass is flying.
I still haven't got round fixing it but it's on the list of things to do this week. This time they will be Loctited so its not going to happen when I go back in August.
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