Replacement stock
The factory stock which came on your weatherby vanguard / howa 1500 rifle, would be best up-graded with a bell & carlson stock. Yes, they are not wood, but they are a whole lot better than wood in too many ways to list here.
However, begin your search by typing in on google "wooden stocks for howa 1500 rifle" and see what pops up.
Guru1911