Bullet drop at 12,000 feet when sighted in at sea level

robAK

Lil-Rokslider
Joined
Mar 19, 2017
Messages
195
Location
ALASKA
Could'nt quite get the best info on different websites regarding bullet drop between the two. I sighted in my muzzy and shoot 3.5" high at a 100, 1.5" low at 150 and 6.5" low at 200. What do you guys think the difference would be shooting at 12000 plus altitude? I read barometric pressure is all that counts, not sure if thats true. If it is here's my data. Where I'm at is sea level barometric pressure is 29.63 shooting Thor 250 gr. bullet and 100 gr. of BH 209 powder. Where I'm going barometric is ~ 30.39. What do you guys think? Should I compensate?
 

ENCORE

WKR
Joined
Aug 5, 2017
Messages
601
Location
NE Michigan
I threw some numbers together, which I will not guarantee absolute correct. Just a WAG.....

I used a BC of .220, 250gr bullet
Velocity of 2,000 fps
150yd zero
At 50' above sea level its approximately 2.5" high at 100yds and 6.3" low at 200yds.
At 12,000', the difference indicates 3.2" high at 100yds and 5" low at 200yds.

Used Strelok ballistics calculator, which you can download free. Phone or computer.
 
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robAK

Lil-Rokslider
Joined
Mar 19, 2017
Messages
195
Location
ALASKA
Thanks Encore. The guy I bought this gun from wrote what it shot at in UT somewhere. It's closer to what you calculated. So it looks like I'm pretty close regardless of altitude. As long as I'm within 200 yards I should be good
 
Joined
Aug 20, 2016
Messages
895
Could'nt quite get the best info on different websites regarding bullet drop between the two. I sighted in my muzzy and shoot 3.5" high at a 100, 1.5" low at 150 and 6.5" low at 200. What do you guys think the difference would be shooting at 12000 plus altitude? I read barometric pressure is all that counts, not sure if thats true. If it is here's my data. Where I'm at is sea level barometric pressure is 29.63 shooting Thor 250 gr. bullet and 100 gr. of BH 209 powder. Where I'm going barometric is ~ 30.39. What do you guys think? Should I compensate?
Might double check your barometer reading at altitude. All the reported pressure from weather stations, like NOAA, compensate for sea level. The actual barometric pressure will be less.

I know that last year in Wyoming during my antelope hunt, my Kestrel was showing between 24 and 25 inches.

Sent from my SCH-I545 using Tapatalk
 
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