Anyone arguing quality bullets are useless, in the .303 or any other, needs to pull their head out of the muskeg- forgive my frankness. I've killed big things with quality bullets (ala Barnes TSX) and with bargain soft points (ala Federal blue box), both in a caliber that parallels the .303 velocity range wise, just bigger, .375 H&H. There is an unquestionable difference. Will a blue box soft point .303 kill a moose? Damn right it will, but a TSX is better. Saying you're silly to buy the TSX is, well, silly.
To the OP, yes Sierra offers the 174gr matchking- not a hunting bullet, but a quality bullet for accuracy which is what it sounds like you're after.