Sighting in 450 bushmaster

Red Dot? Low Power Variable? Muzzle Loader glass?
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Re: Sighting in 450 bushmaster

Postby Hoot » Wed Aug 02, 2017 5:58 pm

Do the math.

It takes a 200gr FTX .000867 seconds to exit a 16" 1:24 barrel at 2412fps (realistic accomplishment).

As it exits the muzzle It has rotated .66 revolutions.

Calculate Rev/sec
1/.000867 = 1153 X .66 = 761.24

Convert Rev/sec to Rev/min
761.24 x 60 (seconds in a minute) = 45,764 RPM

That's a lot of stability! Image

Hoot

EDIT: if I don't have that right, I'll feel pretty foolish.
In Theory, there is no difference between theory and practice. In Practice, there is.
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Re: Sighting in 450 bushmaster

Postby MOOSE EARS » Thu Aug 03, 2017 4:43 am

1:24 twist would produce 150 revolutions in a 100yds

1/2 of a rev per foot X 300ft = 150 revs
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Re: Sighting in 450 bushmaster

Postby mcb » Thu Aug 03, 2017 7:05 am

If the barrel is rifled 1 revolution per 24 inches (BM factory twist) and the bullet exits going 2412fps then wouldn't the bullet, at muzzle exit, be spinning at 1206 rev/sec or 72,360 RPMs?
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