How many rounds would you be putting through a gun in a competition year? Presumably they would be fairly light trap loads.

Then bear in mind that the British game gun was designed to shoot many thousands of game specific rounds through it for driven shooting each season.

It was then expected to be returned to its maker for an annual service and to maintain its reliability in the field.

Given those considerations I feel your concern should be how heavily used that WR trap gun is, what its designed for load is and then whether you like it in your hands. And as has been pointed out, finding a gunsmith trained on British game guns seems to be getting trickier and trickier in North America now. Its not so easy back here in England, either!

Tim