Just checked Natchez and found H4350/8lbs in stock.
http://www.natchezss.com/Category.cfm?contentID=productDetail&brand=HD&prodID=HDH43508&prodTitle=Hodgdon%20H4350%20Extreme%20Rifle%20Powder%208%20lb.
http://www.natchezss.com/Category.cfm?contentID=productDetail&brand=HD&prodID=HDH43508&prodTitle=Hodgdon%20H4350%20Extreme%20Rifle%20Powder%208%20lb.