Sighting in 450 bushmaster

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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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Re: Sighting in 450 bushmaster

Postby jaws » Tue Oct 03, 2017 6:37 am

I just bought a CVA single shot hunter rifle in a 450 Bushmaster. It has a 25 inch barrel. Mounted a 3-9x40 Nikon BDC scope on it. Seems to shoot well. Sighted in at 55 yds. It will shoot 2 through the same hole and 3rd one out just a bit. Using the Hornady Black 250 gr FTX. The ammo box says 2200 fps. was wondering how much that changes through a 25 in barrel.
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Re: Sighting in 450 bushmaster

Postby Hoot » Wed Oct 04, 2017 4:54 am

jaws wrote:I just bought a CVA single shot hunter rifle in a 450 Bushmaster. It has a 25 inch barrel. Mounted a 3-9x40 Nikon BDC scope on it. Seems to shoot well. Sighted in at 55 yds. It will shoot 2 through the same hole and 3rd one out just a bit. Using the Hornady Black 250 gr FTX. The ammo box says 2200 fps. was wondering how much that changes through a 25 in barrel.


Welcome aboard OM. Sorry for it taking so long to get you approved. I was out of town the past 8 days.

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Re: Sighting in 450 bushmaster

Postby RON K » Wed Oct 11, 2017 7:37 pm

i shot my bushy @ 75 yards w / boresighting only & shot a 1.5 in group with 3 shots
i am happy with the results
my bushy is a american made by ruger
bushy is a bolt action i couldn't ask for anything better
i have several rugers and they are all top performers
you talk about the biggest BANG for your buck i sure got it with this one

( got me a set of loading die's )
lookin 4ward to some fun
lol also got me about 1000 #'s plus wheel weights
can ya guess what im going to do with that ? lol
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