My .270 hated both the 130gn and 150gn PPU rounds, spitting them out to entirely random points of impact - I couldn't get better than 3" groups. My stalking partner, on the other hand, gets half inch groups from the same batch of 150gn rounds out of his Tikka T3 and thinks they're the best thing since sliced bread, given that they're £9 a box from Kranks.
Try them - you might get lucky. If they do shoot, I'm damned if I know how - when I pulled a pile of rounds, the brass, bullets and powder charges has massive variations. Bullets varied in weight by up to 2 grains, powder charges by the same and the brass is very inconsistent in internal volume, so pressure must be all over the place...
Adam.