Plugging in the following into JBM trajectory online:
180gr Nosler Partition
3,000fps MV
1.5" sight height
Standard atmosphere
I play with the zero distance to see if I get close to 4.8MOA of indicated drop at 400yds, which should match up with the B&C. A 250 or 225yd zero show less than 4.8MOA of drop, but a 215yd zero has 4.8MOA exactly at 400yds. Using the same 215yd zero, the indicated drop at 300yds is 2.0MOA, which is really close to the 2.2MOA Leupold uses for the 300yd hash bar. The 0.2MOA difference at that range is around a half inch. No big deal. It also tells me that the impact should be 1.9" high at 100yds to get that 215yd zero. So I get my rifle zeroed where my groups are centered up at roughly 2" high at 100yds and then start shooting at 300 and 400 yards to verify the impacts. It should be pretty close, and I'd fine tune it a few clicks if necessary to get the 400yd bar hitting correctly. Those couple of clicks will matter very little at 100-300yd distances but are more important at greater distance. I've seen this procedure work on many hunting rifles my family shoots. Pretty easy once you've done it before.
