I've been curious about the 180's too. the data in the sierra and hornady manuals lumps it in with the 175-178g match bullets, and theres plenty out there for those. I usually see 43-44 g of Varget suggested for the 175 SMK. no first hand experience with that bullet weight though, I've always been content w 168 because I never shoot at 800-1000 yds.
