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Speed vs BC?

 
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  #1  
Old 08-01-2013, 10:53 PM
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Join Date: May 2012
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Speed vs BC?

I was loading rounds for my 243win. Disappointed in her apparent distaste for 107 Amax. But pleased with the performance of 90gr Bergers. It occurred to me if I shoot lighter bullets faster the less time gravity has to work on them. I primarily use the quarter bore for coyotes from muzzle to 5-600 yds. No complaints or issues with my pet loads (75gr amax and 90gr bergers) just curious when does BC trump velocity?
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  #2  
Old 08-02-2013, 07:30 AM
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Re: Speed vs BC?

It depends on your use for the cartridge.
If you are a dialer your primary objective is to get a lot of energy on target accurately at long range and the bigger and sleaker the pill, the better.
If you will be shooting offhand and/or shooting moving game time of flite and drop must also be considered. I personally don't like my time of flite to be any longer than necessary to get a pill downrange to put a hole through my target. I shoot big enough rounds that better drop and shorter time of flite offsets a harder hit rather well.
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Old 08-02-2013, 08:30 AM
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Re: Speed vs BC?

Alberta- you need to run the numbers for your individual loads. the 140 berger out of my 7mm is faster and flatter than the 168 for quite a ways. roninflag
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Old 08-02-2013, 09:08 AM
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Re: Speed vs BC?

You have to run the numbers through ballistic software, as there is no rule of thumb.
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  #5  
Old 08-02-2013, 10:54 AM
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Re: Speed vs BC?

Quote:
Originally Posted by Albertaguide View Post
I was loading rounds for my 243win. Disappointed in her apparent distaste for 107 Amax. But pleased with the performance of 90gr Bergers. It occurred to me if I shoot lighter bullets faster the less time gravity has to work on them. I primarily use the quarter bore for coyotes from muzzle to 5-600 yds. No complaints or issues with my pet loads (75gr amax and 90gr bergers) just curious when does BC trump velocity?
I'm a lil confused by the post

First anything over about 100-105gr out of a .243 needs a fast twist bbl to stabilize from what I've heard.
Second, a "quarterbore" is .25 cal not .243......

My personal opinion on "most but not all" rifle cartridges is it doesn't make a whole lot of difference out to 4-500yds speed vs BC. But the farther out you go, BC becomes king no matter what cartridge.
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  #6  
Old 08-02-2013, 05:24 PM
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Join Date: May 2012
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Re: Speed vs BC?

Quote:
Originally Posted by Lefty7mmstw View Post
It depends on your use for the cartridge.
If you are a dialer your primary objective is to get a lot of energy on target accurately at long range and the bigger and sleaker the pill, the better.
If you will be shooting offhand and/or shooting moving game time of flite and drop must also be considered. I personally don't like my time of flite to be any longer than necessary to get a pill downrange to put a hole through my target. I shoot big enough rounds that better drop and shorter time of flite offsets a harder hit rather well.
Pretty much what I do now. Heavy for caliber in my target loads and faster medium for big game, light weight for varmints. And yes I run all my loads thru AE ballistic and then compare to the findings to real world trigger time. My question was more out of curiosity than a request for advice and I know quarter bore is .257, late nights early mornings and 14 hour days takes a toll. (no I don't reload while tired)
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  #7  
Old 08-03-2013, 08:47 PM
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Join Date: Mar 2008
Posts: 89
Re: Speed vs BC?

like the others said, run the numbers on your round. For me I almost always run heavy. The reason is I don't have as much of a problem with hitting what i'm shooting at from the vertical standpoint, it's the windage and in the wind game BC is always the best way to go.
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