I have a NF 8-32x56 with the discontinued NP-1rr reticle. I recently started planning out a range at my house, I don’t have a laser rangefinder so I set out a 9” diameter steel plate. The plate ended up fitting perfectly while at *R magnification between I and J which would be 18” at the 500 mark. My question is would that mean the range is approximately 250yds? It was definitely to large for the 300yd 9” circle so I know it’s less than that.