Thanks for all the thoughts. All I can say is, last Saturday I went back to the tc factory rear sight. It shot much better. One group was really nice, and then I started fooling around with loads, but my question was answered; my experiment with the barrel mounted peep that far away from my eye didn't cut it.
However, i don't like the factory rear sight and the bead front. Sighting by putting the little circle at the bottom of a round rear site seems imprecise, and I'd like to either have a post front site with a nice straight edged top lined up with a squared notch rear. I've got a couple nice blade front sights, but might check out dixie or totw for an appropriate rear.
Such are the joys of bp, huh...
Anyway, thanks again all!
S