Does anyone have an explanation or a reference site explaining the drag functions in ballistic tables software? For example I keep coming up on G1 G2 G3 etc... What exactely is this information?
Thanks
R.
Thanks
R.
Drag Functions in Ballistic software What is it???
- Thread starter rickp
- Start date
Re: Drag Functions in Ballistic software What is it???
I'm glad you asked this question...haha I was actually just thinking about that today. My ballistic program lets me choose between G1, G2, G3 etc...and I have no idea what the differences are...
I'm glad you asked this question...haha I was actually just thinking about that today. My ballistic program lets me choose between G1, G2, G3 etc...and I have no idea what the differences are...
Re: Drag Functions in Ballistic software What is it???
The best explanation available is Bryan Litz's book "Applied Ballistics For Long Range Shooting."
I would highly recomend it to anyone serious about shooting.
Basically, they are different models of determining ballistic coefficients (BC). The G7 conforms best to long range rifle projectiles...the caveat is that most (if not all) ballistics programs only include G1 data.
Most bullet manufacturers only give G1 datum as well. Therefor, unless you know the G7, it is best to use G1.
The best explanation available is Bryan Litz's book "Applied Ballistics For Long Range Shooting."
I would highly recomend it to anyone serious about shooting.
Basically, they are different models of determining ballistic coefficients (BC). The G7 conforms best to long range rifle projectiles...the caveat is that most (if not all) ballistics programs only include G1 data.
Most bullet manufacturers only give G1 datum as well. Therefor, unless you know the G7, it is best to use G1.
Re: Drag Functions in Ballistic software What is it???
By the way, Mr. Litz's book lists both G1 and G7 for a bunch of popular bullets.
There has been some great threads on the subject here, too. Use the search function in my sig.
By the way, Mr. Litz's book lists both G1 and G7 for a bunch of popular bullets.
There has been some great threads on the subject here, too. Use the search function in my sig.
Re: Drag Functions in Ballistic software What is it???
But to actually answer the question - BC (Ballistic Coefficient) of the bullet (or other projectile) relates to Drag Coefficient of that projectile. Obviously projectile shape (e.g. round nose, pointed, flat base, bottom tail...) impacts drag. There are several "standard" projectile shapes for which those coefficients were computed (so G1, G2,..., G7, ...). G1 is for projectiles that look like an old pistol round-nose bullet. G7 is for projectiles that look like Lapua Scenar bullet. This is why for long-range shooting (which involves Scenar-like bullets and not 45ACP FMJ ones) G7 BC reflects the bullet shape and its associated drag better.
Now buy and enjoy Bryan Litz's book!
But to actually answer the question - BC (Ballistic Coefficient) of the bullet (or other projectile) relates to Drag Coefficient of that projectile. Obviously projectile shape (e.g. round nose, pointed, flat base, bottom tail...) impacts drag. There are several "standard" projectile shapes for which those coefficients were computed (so G1, G2,..., G7, ...). G1 is for projectiles that look like an old pistol round-nose bullet. G7 is for projectiles that look like Lapua Scenar bullet. This is why for long-range shooting (which involves Scenar-like bullets and not 45ACP FMJ ones) G7 BC reflects the bullet shape and its associated drag better.
Now buy and enjoy Bryan Litz's book!
Re: Drag Functions in Ballistic software What is it???
Pick the one that most resembles your bullet.
G1 actually was written to model 19th Century artillery rounds.
Somebody invents a new Gee model about every other week but I wouldn't get wrapped around the axle about them until some manufacturer starts listing that Gee in their data.
Pick the one that most resembles your bullet.
G1 actually was written to model 19th Century artillery rounds.
Somebody invents a new Gee model about every other week but I wouldn't get wrapped around the axle about them until some manufacturer starts listing that Gee in their data.
Re: Drag Functions in Ballistic software What is it???
i KNEW it wasn't about guys dressed up as gals!
i KNEW it wasn't about guys dressed up as gals!
Re: Drag Functions in Ballistic software What is it???
Great info. Thanks guys for taking the time.
Rick.
Great info. Thanks guys for taking the time.
Rick.
Similar threads
Precision Rifle Gear
Tango Innovations FIRE4000 WMLRF Initial Impressions
