jbm

Bullets are hitting the bullseye at 200 yards at altitude of 5,500 feet. Scope elevation knob is set to zero. If I do not change the scope elevation knob; then, bullets will hit some unknown distance below the bullseye at 200 yards at altitude of 3,000 feet. How many MOA do I need to turn...

Tried the JBM main page, getting error # 1500 temporarily unavailable. All the specific links return not found message. I just reloaded the browser in my Phone & was going back to replace all my lost cards. Hope they aren't lost for good...

Another newbie question.In the JBM calculator do I enter the 20 MOA difference in my scope base under Elevation or does it not matter. I've tried entering it but the end result between this and entering 0 is the same. Was out for the first time last night on the DND range shooting 600 metres...

<span style="font-size: 14pt">On behalf of "JBM Small Arms Ballistics" and "Applied Ballistics, LLC" I would like to announce the addition of measured BC data to the JBM bullet library.</span> For those who are not familiar with the free JBM online ballistics calculators, this is an excellent...

http://www.eskimo.com/~jbm/calculations/calculations.html very very nice and precise... for drop,wind,energy and created ballistic card

Well I've been trying to stretch my wings with my 6.8SPC. I don't have a chrono, but fortunately for me I just recently downloaded a ballistics calculator for my motorola Q so it help a lot. I input all my data with the numbers I found posted about the 6.8SPC and bullets I was using I basically...

Is there a setting in JBM for 20 MOA bases?