Handcannon...John traveler is correct. I had a contender barrel that was chambered for 30 Herrett (which is a short 30-30 case) & have also owned a rifle chambered for 7.62 x39 (rimless case). Doing a side by side comparison the 2 cases are quite simular, but not interchangeable. My advice is to either buy you a 7.62 x39 barrel or a 30-30 Win or 30-30 Ackley Improved. 30 Herrett is a pain to handload. Good hunting & shooting