I am underway on my 50bmg build but could do with some build advice. Due to being in England I couldnt get the BAT EX action I wanted - instead I have got hold of a Barnard GP for New Zealand which comes complete with match trigger. For the stock - I have a Mc Millan 'Big Mac' on the way which I intend to use with a heavy duty bipod I have already bought. Has anyone advice on the barrel specification? I was thinking along the lines of 36" 1 in 12 twist with a Steyr muzzle brake Nitroexpress.