Well yesterday I spent a little time at the range with my 7 RM and some 175g uld rbbt loaded with 66.2g H1000 which is good for .5" at 100 yards and right at 2900fps. I wanted to get an idea of the BC so I plugged in .650. Now according to my program with a 100 yd zero, 175g at 2900fps, .650 BC, I needed to have 72 clicks to be dead on at 800 yards. Well after zeroing at 100 yards and double checking the velocity (2900) we went back to the 800 yard line firing on the 15" gong. My first shot impacted about 2ft low according to my friend the spotter. I thought maybe I pulled so I did not touch the clicks and let the 2nd shot go. It impacted in the same spot, about 2ft low. Well now I was pretty discouraged and knew the BC for my drops wasn't .650. I ended up needing 10-12 more clicks to be dead on. So instead of needing 72 clicks, I was at 82-84 clicks. After I got home, I plugged in .6, then .550, .500 and what I found out in terms of drop was that my BC is in the general neighborhood of .500. This seems awfully low to me, but matched up to my trajectory at 800 yards. I feel 800 yards is a fair distance to compute a field drop generated BC. I did not shoot any groups, but I had no problems hitting the 15" gong off the bench once my zero was confirmed. There was little to no wind. Just thought Id keep ya'll informed.