I have a Ruger M77 (shotgun safety) .308, Im thinking of buying a new barrel for it as it doesnt seem to group (scope, trigger, mounts, bedding all checked) sub 4inch. Looked at Border/Archer Barrels and they seem a good buy but pricey. As its not my primary deer gun im loathed to spend £500 on a barrel if I can help it. Heard good things about Lowthar Walther, but cant find any prices/stockists? Any other makes I should consider?