Neale,
Sorry about the slow reply, went to the State BGR in Gladstone over the weekend.

Alan Swan did the barrel and feeding work on the 450, in the days "pre Jim". Unfortunately Alan is no longer doing much work, which is a real pity, as he had a knack for Big Calibre Rifles. Jim did the bolt handle and a bit of other work on it and Darryl did the stock for me.

David