Just completed forming 100 rounds of .357 Starline brass in .357 to .256 Win. Mag. First, lubed all .357 cases with Shaler Rislone. 2nd. Ran cases through a .30 Cal Mauser sizing die, adjusted so it only sizes them down a little, length of .256 from bottleneck. 3rd. lubed inside of neck with Shaler Rislone. 4th. ran cases into .256 win. Max sizing die adjusted so case fit mt .256 Win. Mag barrel
Tried each case in Thompson Contender .256 Barrel. All cases fit into action and snapped closed. 5th. Put cases in vibrator to clean case lube. Next step is prime and then load wit cast bullet from Lyman Mold 65 grain.
I am ready to sell the .30 mauser 3 die set including powder dipper and shell holder. they are Lee Green round case Dies. Email dworley790@gmail if interested, price $30.00 plus $8.00 shipping.
Good luck in forming your cases. 100 rounds, no imperfections!!