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To: xsrdx, squantos, travis mcgee
the optics??....my question as well. Aren't the .50s fairly flat out to 1000 meters or so....as compared to almost any other caliber sans a Lapua or that new Cheyene round?
37 posted on 04/25/2002 12:52:36 PM PDT by wardaddy
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To: wardaddy;xsrdx
Here's ballistic data for a specific round...obviously environment conditions and bullet data are more than likely different from the specific Canadian event.

Worth looking at for reference...at 2500 yards there's a 2460 inch drop or just around 100 MOA...a Loopy Mark 4 M3 has 72 MOA adjustment and not all of that up...I'm not sure what the Canucks are using...

Tom Miller's Extreme Firearms -Ballistics for the Windrunner

Ballistics for the .50 BMG
The following information was given to Tom S. Miller by Mr. Skip Talbot, FCSA consultant, regarding the ballistics of the .50 BMG cartridge. This information reprinted with permission from Sierra Bullets Infinity Exterior Ballistics Software. Copyright 1999 Sierra Bullets LLC All Rights Reserved.

Atmospheric Conditions
Humidity=50%
Temperature=45 degrees Fahrenheit
Wind Velocity=1 mph @ 3:00 (full value wind)
Elevation=5000 feet above sea level

Cartridge
.50 BMG
800 grain LRS solid projectile (Similar to Barnes 800 grain borerider)
ballistic coefficient=1.095
muzzle velocity=2650 fps
rifle zeroed @ 200 yards

@ 1000 yards
velocity=2015 fps
energy=7200 ft. lbs.
drop=236 inches
wind drift=2.93 inches
time of flight=1.298 seconds

@1750 yards
velocity=1630 fps
energy=4720 ft. lbs.
drop=892 inches
wind drift=9.39 inches
time of flight=2.458 seconds

@2000 yards
velocity=1482 fps
energy=3900 ft. lbs.
drop=1355 inches
wind drift=13.6 inches
time of flight=3.037 seconds

@2500 yards
velocity=1266 fps
energy=2849 ft. lbs.
drop=2460 inches
wind drift=23 inches
time of flight=4.135 seconds

@2800 yards
velocity=1159 fps (projectile becomes sub-sonic)
energy=2387 ft. lbs.
drop=3375 inches
wind drift=30.15 inches
time of flight=4.88 seconds

Information about the Velocity of Sound at different air temperatures

32 degrees F.=1088 fps

68 degrees F.=1129 fps

212 degrees F.=1266 fps

932 degrees F.=1814 fps

Home of the Windrunner XM107 .50 BMG Tactical Take Down Rifle.

Please Note: All State & Federal Laws apply to all purchases.

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Copyright © 2001 Hyacinth Software

43 posted on 04/25/2002 2:29:38 PM PDT by in the Arena
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