xsn10s
Well-Known Member
- Joined
- Mar 7, 2016
- Messages
- 7,626
I also use JBM along with other ballistic calculators. I get my 100 yard zero and plug in all the numbers such as muzzle velocity, altitude and so on. From my 100 yard zero I either dial using my knobs to different distances, or use my reticles which are mil based. If you have a standard duplex reticle you can use that also, it just takes alittle more time to figure out how your reticle subtends.Following up on this, let me pose a scenario - if I zero at 100 yards, then without adjusting my scope I shoot at 200 and 300, get tight groups, and measure the vertical drop from the POA to the center of the groups. JBM would tell me what that drop *should* have been at 200 and 300, but what if my measured drop is different than the predicted drop? As a user, how would you approach that?