I think you have a rifle that is absolutely begging for a heavy cast lead conical. That should easily be a 200 yard rifle with a good heavy conical and an LRF. I really like what you put together there.
What rear vernier did you use?? And how did you mount it?? Is that a blade on the front?? I would bet that a little taller bead would tighten your groups up even a little bit better.

Tom.