Only time will tell. For me personally, right now there's only one high bc bullet that I would consider for a cartridge such as this. It's a 170 eol. So Winchester is going to need help from someone to supply them with some consistent high bc bullets for their factory ammo offerings. But I guess they didn't just randomly base the 2840 fps from an imaginary 175gr .277 bullet. They must already have a 175gr bullet they have been working with.