I bought a set of 6.5 Jap dies and it came with a #7 primer seating die. I have read that I need a #2 die. Will the #7 work? Also it came with a 137 N/S die. I have another 137 N/S die and there are differences in their length. One is 1.568 and the other is 1.426. Which one is better? Thanks Mike