Didn't load anything but prepared a dummy 7.62x38R to setup dies on my 550. Turned out real good easy falls in/out of cylinder and will create a gas seal. Have one Frankenstein setup: 30 Carbine sizing, then 31 Long M Die to expand case mouth, 32-20 seater die with 25-20 seating plug (to push bullet below case mouth) and finish it all up with 30 Carbine crimp die to overcrimp final round