Bullet Drop?

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BowhuntPAbucks
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Bullet Drop?

Post by BowhuntPAbucks »

Certain there is a math equation that would help me figure this one out on my own, but I don't know it. Too bad math teachers didn't use ballistics equations and shooting range labs in highschool to teach math...I am sure I would have taken more of an interest.

If I am shooting 125 gr. Speer TNT at 2000 fps and am zeroed in at 100 yards with my optic,
What would be the bullet drop of a 220 gr SMK shooting 1000 fps at 100 yards with the same optic aimimg at the same point of impact??

Maybe the same question at 50 yards??
WalterGA
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Re: Bullet Drop?

Post by WalterGA »

Go to the bullet manufacturer and get the ballistic coefficient for the bullet you're loading. Plug the info into here:

http://www.hornady.com/ballistics-resou ... calculator
tfbit
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Re: Bullet Drop?

Post by tfbit »

Pointblank is a pretty good free program for general ballistics but you're going to have a hard time finding something that will show ballistics for a bullet based on a different bullets zero, which is what I think you're asking for.

http://www.huntingnut.com/index.php?name=PointBlank
No matter what you read on the intarweb CCI450s and CCI41s ARE NOT BALLISTICALLY IDENTICAL with H110! I'm also not a intarweb lawyer so I don't argue with anyone who is.
Alien
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Re: Bullet Drop?

Post by Alien »

http://www.nikonsportoptics.com/Nikon-P ... 4925-tab-2

You can use this app on a PC or if you have an IPhone or IPad you can download the app to them.
tallburnedmidget
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Re: Bullet Drop?

Post by tallburnedmidget »

This trajectory calculator will help but nothing beats real testing. Just fill in the info. Basically pick your bullet or a similar one, change the speed, change the zero distance, and finally change the increment you want to see speed and drop at (every 10yds should be small enough).

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi
BowhuntPAbucks
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Re: Bullet Drop?

Post by BowhuntPAbucks »

Yes this is what I am asking. I appreciate the balistics calculator sites but I am most likely going to have to just shoot a 220 grainer 100 yards and see how much it drops. I'll just use a really big piece of butcher paper.

I was wondering if anyone has done this and could give me a ball park.
tfbit wrote:Pointblank is a pretty good free program for general ballistics but you're going to have a hard time finding something that will show ballistics for a bullet based on a different bullets zero, which is what I think you're asking for.

http://www.huntingnut.com/index.php?name=PointBlank
tallburnedmidget
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Re: Bullet Drop?

Post by tallburnedmidget »

I have some info but it isn't apples to appels.

I am zeroed with 110gr TTSX at 100yds flying at 2370 fps with a suppressor.

I went to the 50yd range a month ago and my 208 A-max with a suppressor flying at 1029fps were printing 4 inches below the bull and 4.5 inches right of the bull

I didn't shoot at 100yds with the 208 A-max but I have a feeling the initial drop would have been 11-12" low from my 100 yds zero on my 110gr TTSX.

Your butcher paper idea sounds about right. Also write down the location of your clicks so you can zero back and forth between super and subs easily. Having a scope with tactical/quick turrets helps a lot in this area.
tfbit
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Re: Bullet Drop?

Post by tfbit »

When I first started with Blackout I was often shooting at 50 yards (rifle zero was at 100 yards) and if I remember right 125s (2200 FPS) were a smidge low and the 220s were about 4" low at 50 yards. Looking at 220 subs (I try to load to 1050 FPS) ballistics with a 50 yard zero, and slightly remembering shooting 125s and 220s at the same paper at 100 yards, I think you'll be around 10-12" lower than the 125s at 100 yards.
BowhuntPAbucks wrote:Yes this is what I am asking. I appreciate the balistics calculator sites but I am most likely going to have to just shoot a 220 grainer 100 yards and see how much it drops. I'll just use a really big piece of butcher paper.

I was wondering if anyone has done this and could give me a ball park.
tfbit wrote:Pointblank is a pretty good free program for general ballistics but you're going to have a hard time finding something that will show ballistics for a bullet based on a different bullets zero, which is what I think you're asking for.

http://www.huntingnut.com/index.php?name=PointBlank
No matter what you read on the intarweb CCI450s and CCI41s ARE NOT BALLISTICALLY IDENTICAL with H110! I'm also not a intarweb lawyer so I don't argue with anyone who is.
BowhuntPAbucks
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Re: Bullet Drop?

Post by BowhuntPAbucks »

Thanks for the info all. I'll start by shooting at 50 yrds and then move out to 100. I just wanted a ballpark to make sure I would hit paper and not waste ammo. Thanks
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dellet
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Re: Bullet Drop?

Post by dellet »

This will get you close. With any of the ballistic calculators. use a 10 yard zero or whatever the shortest distance they will allow. Set sight height at "0". Enter your bullets.

208 Amax at 1000fps 10 yard zero hits 11.8 inches low at 100 yards.

125 Speer tnt at 2000 fps 10 yard zero hits 4.2 inches low at 100 yards.

your drop should be about 7.5 inches different
300 Blackout, not just for sub-sonics.
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