Pipe External Threader

No, when a die starts no mater how careful you are, it will not start straight. You will get an off set, which will cause pellet strikes in the LDC/madarator. These type threading jobs need to be single pointed threads on a lathe. Both enternal and external has to be done this way to get strike free alingnment. Even a blind squirrel find an acorn once in a while, go for it, give it a try and let use know how it goes.
good luck
CH