# A math question of sorts

Discussion in 'General Rifle Discussion' started by Hot Sauce NARC, Nov 28, 2009.

1. ### Hot Sauce NARCNew Member

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lets just say i want to shoot 500 yards with my 308.

the ballistics table says the bullet will drop 51.5 inches at 500 yards

The hornady ballistic calculator says at that distance i will need to come up 9.9 MOA. I have calculated that this will only be 7.7 clicks up from a 200 yard 0 on my 1/4 MOA Leupold VARI X 3

So why is this calculator telling me the bullet will drop 51.5 inches at 500 but then it tells me i will only need to come up 9.9 MOA im missing something here. Im sure one of you had sone this a few more times than me and can help me understand how it all works.

2. ### mrm14Active Member

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All this info is critical to calculate your external ballistics and to have these calculations somewhat accurate.

As far as in field real time weather info device look up the Kestral 4500np thats what I use and it works well. Also It's kind of a cool device to have when in the "outback" on longer term camping trips. Also, instead of keeping my data written on paper notes, I use a ASUS heavy duty PDA loaded with the ballistic software I need to keep my info.

Last edited: Nov 28, 2009

3. ### Hot Sauce NARCNew Member

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thanks mrm14:

i was on the web after that post and i found a more advanced calculator that asks for alot more factors it gave me my click values on 168gr FGMM out to 500 yards as well as my windage "dope"

I went out yesterday and it was almost spot on. it was one or two clicks off on elevation but but the wind was stedy at about 8mph and gusting to about 20 so it was kinda hard to figure windage for both stedy wind and gusts but i had fun. Range report to follow.

4. ### mrm14Active Member

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What ballistic calculator did you find? I'm really oblivious to them.
Did you look at the Kestral weather device? It is expensive but even with these internet calculators they will give you current real time info to enter. As you may go further out in distance for shooting, their value for what you may be trying to do is invalubale.

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6. ### DillingerNew Member

Hot Sauce - While it's not free, this is BY FAR the best source for information on ballistics. This guy, Art Lejsa, bascially re-wrote the mathmatical formula on what a bullet does in flight.

Pejsa Rifle Ballistics: Art Pejsa's Rifle ballistics software and books

This is the best software that we have tested to date. The most accurate.

Chey Tac's Intervention system is on my list, but at the price of just the software, I need to try and blackmail someone at SHOT to get the Military Copy.

JD

7. ### mrm14Active Member

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Last edited: Nov 29, 2009
8. ### Hot Sauce NARCNew Member

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thanks guys

im going to keep shooting this rifle and my savage if they ever send it back and i may just sell both of them and some other things and have somthing built (im thinkin 260 rem) that will necessitate such equipment and software.