I have been shooting my 1917 quite a bit at 200- 300 yards lately. The rifle groups wonderfully at all ranges, is spot on @ 100 (using 155 gr match bullets @ 2700 fps- trying to mimic service ammo). To hit the bull @ 200, I set the ladder @ 225. @ 300, I hit the bull w/ the ladder @ 425. Is this common w/ 1917's