There had been some efforts towards considering intermediate calibres, with the US Ordnance Board sponsoring comparative trials in the early 1930s of the effectiveness of different rifle cartridges using anaesthetised pigs and goats to assess wounding effectiveness. They concentrated on a .256 (6.5mm), a .276 and the existing .30. The .256 (8g at 820 m/s, for 2,700J - much more powerful than the .25 Rem) most impressed the testers, but the Board chose the .276 Pedersen (7x51) a medium-power round developing 2,400J (similar in power to the 6.5mm Arisaka and to the modern 6.8mm Rem), which would have made an effective assault rifle cartridge. However, the army was still thinking in terms of long-range semi-automatic fire, a mindset which did not change until the 1960s. The .276 cartridge was rejected in 1932, partly for cost reasons but also because it did not offer sufficient long-range performance.