How does as strong tailwind effect BC. If you are shooting a Juggernaut at 2750 and a 215 hybrid at 2550 and you get a extra 10mph gust, will the faster bullet with less BC impact the target higher than the slower bullet with better BC.
I asked because I'm expecting some big tail and headwinds this weekend. When I plugged my load in to JBM, at a 0 mph wind from 180 degrees my drop was 21" less than when a 20mph wind was plugged in. That doesn't make sense. I read a blog on Bison ballistics that said it shouldn't be that dramatic http://bisonballistics.com/articles/why-headwinds-are-more-difficult-than-crosswinds but the angle of head and tailwinds effects the bullets more dramatically horizontally than a true crosswind. In 0 wind condition my load has shown on several occasions to have little vertical, when I see changes in that this weekend (not having shot much at 1k and never in strong head or tail winds) , I'd like to be prepared as much as possible to try and understand what's going on so that I don't drag my shiny new rifle all the way back to Mississippi behind the vehicle.![]()
Great article. This is exactly what we are going to get this weekend. Sunday will probably be worst but who knows.
I don't know how to put it in a ballistic calculator or how much value a head or tail wind has. However, after 2 days of tail wind and 1 day of head wind it can and will push you up to dang near and 8 and down to dang near an 8. Saw it happen to f open and tr shooters all at the same time up and down the line from 284's to heavy bullet 308's.
Those cupcake conditions produced many waterline 6, 7, and 8's as wellWe must have been at a different match or you need to wear your glasses, everyone i saw shooting never had a shot go above or below the 10 ring. Those "cup cake" conditions we shot in tend to keep the vertical tight........![]()
How does as strong tailwind effect BC. If you are shooting a Juggernaut at 2750 and a 215 hybrid at 2550 and you get a extra 10mph gust, will the faster bullet with less BC impact the target higher than the slower bullet with better BC.
Yes. Bullet BC is relative to the air it moves in. Just like muzzle velocity is relative to the barrel; higher fps numbers with a fixed barreled action, lower when shot off ones shoulder and the barrel's moving backwards while the bullet leaves.You'd probably be close calculating the fps of the wind and adding or subtracting it from the muzzle velocity.