I have a Mark V Deluxe and it is a fine, accurate rifle. I have no experience with the Ultra lightweight. I have seen postings where they are hit or miss on accuracy but Weatherby does have a 1.5" guarantee. I have a 270 and 280 and it is 6 of one 1/2 dozen of the other. I have been considering the Ultra in 300 Roy for my next Weatherby.