I have the 45th edition of lyman and am wondering what Rx 7 is. I saw a post by seafire and he said he found some loads for a .22-250 in the 47th edition using reloader 7. So my question is, is Rx7 the same as reloader 7? thanks all

RE-7
RL-7
RX-7

All the same

Thanks for the info Mr. Ricciardelli.