Ballistics tables

[shooterfpga]

So im working my dope charts and normally use the default g1 bc. Ive since changed them over to the g7. All the bullets i shoot fall into the g7 category and my charts seem to match better using this. Anyone else switch to g7? Im also using litz. My 308 definately matches my dope charts but my 6.5 creedmoor im still trying to work.

[shooterfpga]

Also, i did change my bc to match the g7 for its corresponding rounds.

[JMP]

G7 tends to be a better proxy for more ballistically efficient bullets once the G1 gets too high; namely, it'll be a better approximate on the projectiles that are relatively longer. That said, some manufactures don't publish G7, so you have to use G1.

[shooterfpga]

G7 tends to be a better proxy for more ballistically efficient bullets once the G1 gets too high; namely, it'll be a better approximate on the projectiles that are relatively longer. That said, some manufactures don't publish G7, so you have to use G1.

Im using litz bc for g7. I think almost all the ammo i shoot only has g1 easily accessible without a lot of googling. When you say longer do you mean more than the average sized hpbt profile/build or bullets 2" and larger?

[Rbutler]

g1 is for flat base g7 is boat tail if im not mistaken?

http://bulletin.accurateshooter.com/2013/01/g1-vs-g7-ballistic-coefficients-what-you-need-to-know/

[shooterfpga]

g1 is for flat base g7 is boat tail if im not mistaken?

http://bulletin.accurateshooter.com/...-need-to-know/

This is what i had read as well which is why i switched to g7 today. I dont shoot any flat bullets at all. Theyre all hbpt and amax.

[shooterfpga]

Heres another question. How many of you run density altitude vs true altitude? I have an idea that density altitude has a greater effect on the results than true altitude.

[Rbutler]

it depends, DA if im not mistaken is a calculation based on altitude BP and temperature.

One thing to consider is the best ballistic table you can buy is a white peice of paper you write your actual drops on.

[shooterfpga]

it depends, DA if im not mistaken is a calculation based on altitude BP and temperature.

One thing to consider is the best ballistic table you can buy is a white peice of paper you write your actual drops on.

I verify all my dope so its not really an issue. What i cant verify on a first shot or without using an app is changes for different areas i shoot in.

[kcstott]

G5 is more realistic to a standard spitzer bullet.
G7 was written for VLD bullets.

i.e. the SMKBT .308 220 gr follows a G5 closer then a G1 or a G7

[shooterfpga]

G5 is more realistic to a standard spitzer bullet.
G7 was written for VLD bullets.

i.e. the SMKBT .308 220 gr follows a G5 closer then a G1 or a G7

I wish i could use the g5. I saw this but what i use only has g1 and g7 unfortunately. There might be a hidden way for me to select g5 but not what i can see so far.

[Rbutler]

I verify all my dope so its not really an issue. What i cant verify on a first shot or without using an app is changes for different areas i shoot in.

Ok cool, I know a lot of people who think app dope is THEIR dope. I ask if they confirmed it and they ask why.....

[kcstott]

Ok cool, I know a lot of people who think app dope is THEIR dope. I ask if they confirmed it and they ask why.....

Yep In reality you should just use the app dope as a guide to get you close then write up your own drop tables according to what you actually shoot.

If you know how to us XL it's not hard to make up your own drop table based of the military's style of table.

As for the G5 it's on Ballistic AE the full version. and a G5 is very close to real world ballistics with non VLD Spitzers

[BillyGoatCrawler]

Do you guys ever use excel to graph out your curve based on dope from a few confirmed distances. Like shooting 500, 700, 850, and 1000. Then entering this in excel with your real hold overs to get a best fit curve? I'd imagine this would fill in the other ranges pretty accurately if you have a few real world holds.

[JMP]

I think it's easiest to just use the app on a Kestrel. Get the parameters as close as possible, then tune the velocity for the best fit curve at various distances on various days. Then, it seems to deliver better results in various conditions since environment is built in.