G1 vs G7

[med358-boise]

I was using the Hornady ballistic calculator and with G1 @ 800 yds with .450 bc my MOA adj is 18.1. Using the same BC and G7 its 13.5.
If I reduce the BC to .27 at 800 yds my adjustment is 16.3. My initial thread was using the same BC for G1 and G7 which is why the difference.
I ran your number on the Hornady calculator and got 19.9 for G1 and 20 for G7. Remember the 180 has a higher BC than the 168.

Yes, but to re-emphasize G1 and G7 are completely different formulas and "metrics". Its almost like saying I had a formula written for lbs per sq in of torque then input that value into another formula that was looking for nanometers of torque as a variable and then wondering why I got a weird answer.

 

[memtb]

I would add that all published BCs are just that published BCs will be slight different in every rifle based on velocity and some other factors. Therefore to be very accurate - you zero @ a distance usually 100 then shoot and document actually drop several 100 yards further and then record your drops. Then inpour actual drops and either manual manipulate BC or some programs will calculate the "true or correct" actual BC.

This somewhat addresses another topic on this forum, "zero range", which helps me justify my position on that topic.


Using your statement- I would add that all published BCs are just that published BCs will be slight different in every rifle based on velocity and some other factors


With my 300 yard zero, and the assumption that there will be small discrepancies as distance is increased, starting out with a 300 yard zero and my limited, self-imposed maximum shooting distance on game ……should somewhat reduce those discrepancies at my maximum distances.

Meaning ……I should be closer to my desired point of impact at 600 yards with my 300 yard zero, than I would be with a 100 yard zero, when atmospheric changes will undoubtedly affect the factory stated bc! memtb

 

[Clem Bronkoski]

This somewhat addresses another topic on this forum, "zero range", which helps me justify my position on that topic.
With my 300 yard zero, and the assumption that there will be small discrepancies as distance is increased, starting out with a 300 yard zero and my limited, self-imposed maximum shooting distance on game ……should somewhat reduce those discrepancies at my maximum distances.
Meaning ……I should be closer to my desired point of impact at 600 yards with my 300 yard zero, than I would be with a 100 yard zero, when atmospheric changes will undoubtedly affect the factory stated bc! memtb

I don't think so memtb. You still have to shoot to determine actual drop. Even your own statements above enforce that...an assumption and should won't put you on target. Even 1 MOA difference at 800 yards would be a complete miss on a deer. Heck a dead center hold at about 550 yards with one MOA error would be a complete miss. Practice and shooting at varying distances are the only true ways to tell where your bullet is going to land.

 

[memtb]

I don't think so memtb. You still have to shoot to determine actual drop. Even your own statements above enforce that...an assumption and should won't put you on target. Even 1 MOA difference at 800 yards would be a complete miss on a deer. Heck a dead center hold at about 550 yards with one MOA error would be a complete miss. Practice and shooting at varying distances are the only true ways to tell where your bullet is going to land.

I think that the error percentage while remaining the same, will be less when only effected on a much shorter distance downrange from the 300 yard verified zero.

Let's assume, pulling this out of space, a 1% error on the BC for the previously mentioned reasons. 1% error is significantly less over a distance of the 300 to 600 yards, which is my shooting range limit on game……than would be that same 1% error, starting at 100 yards! JMO.


Practice at various ranges, means little if atmospheric variables are not the same as practice shots. If I could only be certain that the desired animal will continue to stand there while I verify my bullet drop at those atmospheric conditions as compared to a previous shooting foray under different conditions! memtb

 

[cohunt]

Get a ballistic app- most of them have a database of bc's

 

[std7mag]

Distance, yards​	Elevation, inch​	Elevation, MOA​
100.0​	D0.0​	D0.0​
200.0​	U2.2​	U1.1​
300.0​	U9.2​	U2.9​
400.0​	U21.7​	U5.2​
500.0​	U40.7​	U7.8​
600.0​	U67.1​	U10.7​
700.0​	U102.6​	U14.0​
800.0​	U148.4​	U17.7​
900.0​	U206.5​	U21.9​
1000.0​	U280.3​	U26.8​

 

[std7mag]

200 yard zero.

​	​
​	​
​	​
​	​
​	​
​	​

Distance, yards​	Elevation, inch​	Elevation, MOA​
100.0​	D1.1​	D1.1​
200.0​	D0.0​	D0.0​
300.0​	U5.9​	U1.9​
400.0​	U17.3​	U4.1​
500.0​	U35.2​	U6.7​
600.0​	U60.5​	U9.6​
700.0​	U94.9​	U12.9​
800.0​	U139.5​	U16.7​
900.0​	U196.6​	U20.9​
1000.0​	U269.3​	U25.7​

 

[std7mag]

Sorry, got kinda messed up with copy & paste.

 

[Clem Bronkoski]

I don't know what variables you're inputting but your results are different than what I'm seeing. Close but not the same.