Originally Posted by truevil1313
Is a 15 MOA base a good idea for shooting 100-600 yards?
You didn't mention what cartridge you shoot. Most 30 caliber cartridges will shoot to 600yards with less than 15 MOA of adjustment. In that case a 15 MOA base is not important.
I don't shoot an AR15 but the 0.223 55gr has about a 0.2BC and MV of 3,200 fps. 600 yds require about 21 MOA, again not likely to need a base.
A 20 MOA base can be too much for some optics. My long distance optic has has 52 MOA in the up direction, only 12 MOA in the down direction. I can zero a 15 MOA base perfectly. I am 4 MOA short of being able to zero with 20 MOA base. With the 20 MOA base I shoot 4" high at 100 yards, and 0" high at 300 yards.
Your 15 MOA base will serve you well. Don't worry, you're not missing anything not having a 20 MOA base. It will probably be useless at up to 600 yards. But at 700+ yards with an AR you'll be glad you have it. Good luck.