Taking a break in load development for the 257 Roberts and experimenting with the 243 Winchester and the NOE mold. My alloy yields a 103 grain slug. I'm currently working with IMR 4895. 20.5 grains yielded a 1.217" group and 21.0 a 1.452" group but 9 rounds went into .647". More testing to follow. Range is 100 yards.