Your knowledge and advice are very much appriciated. I think those of us who were advocating the use of the OP's FL die, were doing so because for the majority of us, the FL die has been used without problem. I know it has worked for myself. I think we were only trying to reasure the OP that, as long as the ammo produced from his FL die worked in his gun, he didn't need to spend the $ for an additional SB die.
For those that do "run the line" in HighPower matches, maybe a SB die should be considdered, but for the majority of us that reload because we love to do it and we love to shoot AR's a few weekends every month, I don't think we are "required" to use/purchase the SB die.
Thanks again for your knowledgeable input. I personally enjoy it and learn from it.