Kuduae, you are not wrong about strict rules in the London Proof house, my "new" Mannlicher arrived in UK at Hollands 2 weeks ago, the London proof house will not accept it, three reasons, bolt will not go over Go Guage, bore diameter oversize by 0.06mm, groove diameter 0.263, undersize by 0.003" so I canīt get it proofed, not really arsed since I donīt intend to sell it and it has shot over 300 rounds with the 160 grain doing a 3 shot group at 100 yds of 5/8", but annoying. This with a custom Douglas XX barrel ! Most of you have probably heard about the problems at the London proof house in the last 18 months-2 years, Holland, Westley and Purdey having NEW actions and barrels destroyed by bulging in front of the chokes and a few chaps with older stuff going in for reproof being sent back blown barrels, I have been watching what is going on, apparently the London proof house changed the proof loads a while back in shotguns at least, they are trying to sort the problem but some chaps have lost quite a bit of money ! 
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Ruger No 1 303 ,now London proof