the 9,3x53R is an open up 7,62x54R like the 9x57 and 9,3x57 cases are in fact open up 8x57

there is nothing wrong to do this! because I had no 7,62x54r brass at home I bought new Sako 9,3x53R but single cases open with the ch4d die from 7,62 to 9,3 for a test were fine.