Hey guys ive got a handi and im shooting 44,and 357 mag barrels.Im shooting cast out of them ,my question is what grain slugs can i shoot out of these, My44 is 1-38 twist ,my 357 is 1-18.75.I was told 270 was max for my 44, id like to shoot 300-325gr.And what is it for the 357 id like to shoot 180 out of that. Thanks Mike