I had someone cast the above Saeco#738 255 grain using wheel weights air cooled in the 38-55 B.C.
The dia:.379 and a charge of IMR 3031 excellent bullet 15 rounds from the bench at 50 yards can't say no more then 1 1/2" groupe.
I installed a 2.5x5 simmons scope so no mistakes for error on my part;I will be setting up for a rear peep : I so far have shot 3 different type bullets 264 grain at .380 BHN 13
260 grain hard cast .379
I found each bullet to shoot excellent with IMR 3031 with 26 grains
