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Guesses on muzzle velocity, 300 RUM

 
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  #1  
Old 12-05-2009, 11:10 AM
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Guesses on muzzle velocity, 300 RUM

I'm very, very new to reloading. I do not have a chronograph, I could probably use one if I called several people. I've got a hunting load that's working really well for me, and I'm not sure what kind of velocity I'm getting. Was hoping some more experienced people on here might have some better guesses at it than I do. Trying to make a rough ballistics card out to 700 yards.

Load is

300 RUM
190 Berger VLD Hunting Bullet
88.0 gr 7828
Rem Brass
CCI Magnum Primer

Rifle is Remington 700 APR w/ 26" barrel
Temps average 50 degrees
About ten feet above sea level, on the high ground.
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  #2  
Old 12-05-2009, 11:27 AM
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Re: Guesses on muzzle velocity, 300 RUM

I would just shoot to make your card rather than guess a velocity and hope your getting the BC as advertised. I have never had great luck basing drop strictly off MV and calculated values.
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Old 12-05-2009, 11:34 AM
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Location: North West,Ohio
Posts: 443
Re: Guesses on muzzle velocity, 300 RUM

180 swift with 88.6 grains of 7828 are 3100 with a 26 inch barrel hope this helps or gets you close
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Old 12-05-2009, 01:53 PM
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Location: Long Island, New York
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Re: Guesses on muzzle velocity, 300 RUM

Quote:
Originally Posted by lazylabs View Post
I would just shoot to make your card rather than guess a velocity and hope your getting the BC as advertised. I have never had great luck basing drop strictly off MV and calculated values.
I'd add that when you actually shoot at the extended ranges you will have a MUCH better idea of what the accuracy of your load is at that distance. 1" @ 100 yards does not equate to 7" @ 700 yards. Not anywhere except on the web, that is.

Many shooters are limited to load testing at 100yds - 200 yds and make assumptions as to bullet drop and group size at all other distances. Actually shooting at these distances often tells a whole different story.
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Old 12-05-2009, 02:00 PM
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Location: Mountians of SW NC, near Asheville
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Re: Guesses on muzzle velocity, 300 RUM

"Was hoping some more experienced people on here might have some better guesses at it "

Sorry, anyone with any useful level of experiece knows better than to attempt that.

The others are correct, actual shooing is the better way to find your tragectory and much more accurate than any educated guesses, even when computed from a properly measured speed.

Exerienced hands know it really ain't as simple as computer ballistic programs would lead us to believe.
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  #6  
Old 12-05-2009, 02:03 PM
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Location: USA
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Re: Guesses on muzzle velocity, 300 RUM

No way to guess the velocity accurately. 2 different rifles shooting the same load can give very different velocities.
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  #7  
Old 12-05-2009, 02:20 PM
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Location: Oregon City, OR
Posts: 481
Re: Guesses on muzzle velocity, 300 RUM

Without a Chronograph I would shoot at 2 know distances.

100 yrd zero and 300yrds and work the velocity numbers backwards to get the velocity with a online ballistics caculator.

the further you can shoot the better, if you can not get the drop to match then start looking at BC.
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