Range Report G1 and G7 BC list; Where to find?

[Iggy]

Does anyone know where I can find a list of manufactures and their bullets BC's?

For example like in ballistic calculators where they have a drop down menu listing all the bullets by caliber and manufacture.

Thanks!

 

[mouse07410]

Re: G1 and G7 BC list; Where to find?

IMHO the best source is Bryan Litz book "Applied Ballistics for Long Range Shooters".

At least some manufacturers list their bullets and their ballistics (G1 BC usually) on their Web sites (Google for manufacturer names and explore their sites). Good luck with those, though - especially if you worry about long range hits.

 

[Iggy]

Re: G1 and G7 BC list; Where to find?

Yeah, I understand that most manufacturers still use G1, if there is a source for both that would be great.

Im working on complaining an Excel list, so if someone has those published in that format that would save me a lot of time.

 

[bigwheeler]

Re: G1 and G7 BC list; Where to find?

Berger lists g1 and g7.

 

[The Mechanic]

Re: G1 and G7 BC list; Where to find?

You will also find that manufacturers often "exaggerate" their numbers so real world numbers are not usually found in the books

 

[TiroFijo]

Re: G1 and G7 BC list; Where to find?

Many times manufacturers calculate (don't test with real fire) their BC data, or test over a short (typically 200-300 m) range. For long range accuracy the BC must be established with test fire data over the entire supersonic range.

 

[kraigWY]

Re: G1 and G7 BC list; Where to find?

Sure its better to do our own test at differentranges. But if we're setting by the fire, playing with ballistic calculators its nice to have a source close by that has most of the bullets with out searching the internet looking at different manufactors hoping to find G1 & G7 on different bullets.

The best I've found, (and even it doesn't have all of them) is, as mentioned, Bryan Litz book "Applied Ballistics for Long Range Shooters".

I just keep it handy on my desk and a quick thumbing through the pages finds what I'm looking for on most bullets.

Sometimes even that doesn't work, you just have to call or e-mail the manufactor and ask them.

But yes, even after running the numbers, you still should go out and see for your self what they do.

Don't know about you guys, but I don't have the money and equipment to test all the bullets out there.

I certainly don't have the math & engineering back ground of Bryan Litz so I'll just take his word for it.

In reality I dont shoot good enough to be able to tell if I'm a little off at 1000 yards, whether is in the math or the wind and other conditions. If I had to bet, I would say its my wind call rather then being a tad off in the BC of a bullet.

 

[GreatGonzo]

Re: G1 and G7 BC list; Where to find?

While Brian's book doesn't have all of the bullets, many of the other bullets have been tested and are in the JBM calculator. There have been quite a few noteworthy bullets released since the book hit print. I figure that is yhr nature of the beast.

 

[cali_tz]

Re: G1 and G7 BC list; Where to find?

if you shoot Lapua bullets, you can go even better as you get a pretty continuous drag curve across the bullet speeds, obtained via radar measurement. You can use this drag curve in other programs if you do the conversion to BC correctly, but it's easiest to use the Lapua version of Quickload ballistics downloadable free from their website. Be nice if other bullet mfr's provided the same level of empirical data for their bullets instead of a single constant BC. That being said, as Bryan's book describes well, a single G7 BC gets you pretty darn close.

 

[mouse07410]

Re: G1 and G7 BC list; Where to find?

What's a good way to derive BC's from the (Lapua) Drag Curve?

 

[cali_tz]

Re: G1 and G7 BC list; Where to find?

It's been a few weeks since I looked at it, but the BC, either G1 or G7 can be calculated from Lapua's drag curge, which itself a text file, with two columns:
1) velocity
2) drag coefficient (for that velocity)

I have run across the formulae in Bryan's book, however I don't have it handy. I was originally going to take Lapua's drag curve data, convert to BC G7 and then put that into Shooter. However, I remember doing some of the derivations, according to Bryan's equations, and the resulting BC's didn't look right. So I stopped right there and downloaded the Lapua QTU program (free, runs on Windows), which can either take anyones BC's or the Lapua drag file.

 

[mouse07410]

Re: G1 and G7 BC list; Where to find?

@cali_tz, thanks!

I'll dig it up in Bryan's book then.

I happen to have QTU too (complete), but I want to have a calculator with me int he field - thus need to program Shooter and/or FTE and/or Bullet Flight.

 

[cali_tz]

Re: G1 and G7 BC list; Where to find?

I'll look for it too, refresh my memory on this. I still have not shot enough of my Lapua to compare the results of QTU and Shooter, esp out past 1000 yards. Keep forgetting to bring my laptop.

The big problem with lapua's QTU (free version) is that the rifle zero data can't be separated from the actual shooting day conditions, which Shooter does very well.
In other words, you have to zero and shoot the same day, same conditions, if you want to use the Lapua QTU... sort of useless in other words.

 

[jbailey]

Re: G1 and G7 BC list; Where to find?

Support Bryan and buy his book. Not only will you get G1 and G7's on 200 bullets (maybe more, maybe less, I'm not sure) you will get a great book covering all aspects of long-range shooting. His book was one of the best uses of $50 I ever spent.

 

[mouse07410]

Re: G1 and G7 BC list; Where to find?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JamesBailey</div><div class="ubbcode-body">Support Bryan and buy his book.......His book was one of the best uses of $50 I ever spent.
</div></div>
Funny that you should mention that!

There's Group Buy running.