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same weight/ same POI ?

 
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  #8  
Old 03-08-2012, 11:11 AM
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Re: same weight/ same POI ?

Quote:
Originally Posted by Mada View Post
lets say we have two cartridges. same velocity, identical everything, except the bullet. the bullets weigh the same but the difference in BC is 0.075
is it possible to achieve the same zero at 100yrds?
You can establish a 100yd zero with any and all rifles.

But, the trajectory at varying distances and the windage compensation will always be different unless they at least have the same BC and same MV.

.075 is not a huge difference. So, it all depends on how exact you want them to be.

You can take a lower BC bullet and shoot it a little faster to keep the trajectory similar to the higher BC bullet. But, it's not going to be identical beyond some distance.

-- richard
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Old 03-08-2012, 12:00 PM
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Re: same weight/ same POI ?

Quote:
Originally Posted by Mada View Post
lets say we have two cartridges. same velocity, identical everything, except the bullet. the bullets weigh the same but the difference in BC is 0.075
is it possible to achieve the same zero at 100yrds?
they will not have the same trajectory or flight path if everything is identical otherwise. In this case it won't be very much at all, but they still will be different. There is an algerbraic equation to plot this that figures in gravitational pull and velocity plus the other stuff, but it's easier to plot it out with a PC program if it will allow you go go three or four places in the B/C.
gary
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Old 03-08-2012, 04:16 PM
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Re: same weight/ same POI ?

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Originally Posted by Mada View Post
I read somewhere in my Hornady manual v8 that bullets with the same weight or design (i cbf to find and site) will fly the same? has anybody heard of or know of such?
I doubt anyone could tell the difference between two bullets whose BC varies by 20% at 100 yards. At 200 yards, it will start to show.

What the heck does "i cbf to find and site" mean? I hope you're not using smart phone "texting" language on this web site. I don't have a dictionary to find out what all those abbreviations mean. And, if you are, I think it's very presumptious on your part that all of us know that impersonal communication language.
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Old 03-08-2012, 08:06 PM
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Re: same weight/ same POI ?

Quote:
Originally Posted by Bart B View Post
I doubt anyone could tell the difference between two bullets whose BC varies by 20% at 100 yards. At 200 yards, it will start to show.

What the heck does "i cbf to find and site" mean? I hope you're not using smart phone "texting" language on this web site. I don't have a dictionary to find out what all those abbreviations mean. And, if you are, I think it's very presumptious on your part that all of us know that impersonal communication language.

CBF just means "cant be bothered" or "cant be f**k" sorry, its a web term, assumed you guys knew what it means.. again sorry
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  #12  
Old 03-08-2012, 08:08 PM
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Re: same weight/ same POI ?

Thanks alot for all of your explanations, much thanks
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  #13  
Old 03-08-2012, 08:12 PM
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Re: same weight/ same POI ?

I shoot a Hornady 150gr FMJ and a Hornady 150gr SST in the same rifle. The charge weight is .5grains different, the BC is .017 different; the POI difference is less than moa at 400 yards.

So I practice with the FMJs that are 2/3s the price of the SSTs.
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  #14  
Old 03-09-2012, 12:23 AM
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Re: same weight/ same POI ?

Another qualifier to the question is changes to seated ogive distance to lands -w/resp to a gun's personality. This, because tune greatly affects POI.
And going from a tangent ogive to secant for example, all else equal, can have a big affect on POI and performance in general until optimum seating is again determined.

I can't imagine changing bullets, even lot to lot of the same, without seeing some difference.
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