Shooters Forum banner

operating pressure

  1. Improved x57mm cases - what operating pressures were used to obtain the claimed vel's

    Wildcat Cartridges
    Hi this is my first time so please be gentle :o I've been reading up on the various AI, ICL etc improved cases based on the x57mm mauser / .257 Roberts family. The claims made in Ackley, are that these cases, at least up to .270 and .280 calibres, are giving equal performance to the .30-03...