Anyone tried this before. I miked some SKS bullets and found that they are .310 and I know that most .303 are .311. I should slug my .303 and see exactly what it is. This question has probalby been asked her before but I searched and couldn't find the answer. The rate of twist might not be able to handle the lighter bullet but for plinking and a cheap source of bullets and powder it would provide if it can be done.