My current .223, a Browning/Miroku Low Wall, has a 1-12 twist and it suits my sensibilities which hover in the 40-55 grain range. Short 60's do ok in it too, but they only return MOA accuracy when it does 1/2MOA with 40 grain Bergers and 52 grain Matchkings. Just me, and my rifle - we have no venues for looong range shooting so the lighter bullets suit us fine.
