Waynard, the other dates you are seeing are a fiscal year license I believe. I have purchased both in the past and both work the same as long as you keep it valid. There is a little price difference between the two to offset the different lengths of time.
I just got a build finished and am having a hard time finding scope rings to clear the objective. I have a Nikon Monarch to start out with and it has a 50mm objective. The rifle is a 22-6mm with a Shilen straight blank ~1.250". Without blindly buying scope rings and "trying them on", I figured I...