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Old September 3, 2013, 07:07 PM   #31
JD0x0
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Join Date: January 30, 2013
Posts: 917
Quote:
A .338 Whisper has only lost 120 FPS after 500 yards? I highly doubt it.
Punch in the numbers in a ballistic calculator if you don't believe me. Remember that wind resistance grows exponentially with speed. So slower bullets generally lose less velocity over a given range, compared to the same bullet at a faster speed.

For the example I posted I used a calculated G1 BC of .734 for a 300 grain .338
Berger Bullets 300 grain hunting bullet has a listed G1 BC of .818

I used a temp of 65 degrees at sea level. A subsonic muzzle velocity of 1050fps. Here's what I came up with, with the lower BC of .734

Quote:
Range: 0
Velocity:1050

Range:100
Velocity: 1021

Range:300
Velocity:975

Range: 500 yards
Velocity: 938
With everything else constant, using Berger's BC of .818
Quote:
Range:100
Velocity:1025

Range:300
Velocity:982

Range:500
Velocity:948
Feel free to try yourself, if you don't believe the numbers I posted. I used Handloads.com Ballistic calculator FWIW.
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