Savage 12 6.5X284,scope and long range

Hello all
I have a Savage 12 6.5X284 with a Leupold 8X24X50, 1/4 min. I have install a 20min rail on top of the receiver. My question is, since I get good groups at 100y will I have enough scope adjustment at 1000y.
I know a 20 min rail is 200" at 1K, but it seems to me that if I am hitting at 100y with 20min rail, I will not have enough scope for 1K.

A real dumb question, if I follow the adjustments indicated on the scope paperwork I will be hitting in the dirt 10y infront of me. I Use POI for scope adjustments ( seems opposite for paperwork)
Any ideas?

You more than likely wouldn't even need the 20 minute rail to reach 1000 yards with that cartridge. Depending on bullet and velocity, you would probably only need 24-28 MOA or there abouts to reach 1000 yards with a 140gr bullet with a 100 yard zero. Not sure exactly what scope you have but a quick search shows the Leupold 8.5-25x50 having 87 MOA range of elevation adjustments. So if your cross hairs were perfectly centered in the range of adjustment at 100 yards you should be able to reach 1000 yards no problem. With the 20MOA rail installed you should be near the bottom of the scope adjustment range, within 8-10 MOA which would put you fairly well centered out at 1000 yards with plenty of room to shoot farther out if so desired. Are you going going to be doing a lot of dialing and shooting or simply zeroing at 1000 for paper punching purposes?