Affects of bullet grain wt.

[bboswell]

Y’all are still not focused on the OP’s question.

He never asked about downrange trajectory.

He asked about POI shift at 100yards and that is harmonics not weight nor BC.

No choice but to shoot both and see.

[SaltwaterSlick]

Boy this thread is entertaining.

Started to throw bearing surface and case thickness and burn rates and case capacity and different styles of bullet ogives into the mix but someone will disagree.

Yep, some serious crap bein' spread here!

[tigerscowboy]

Everything else the same...

Additional projectile weight will = additional projectile drop in elevation at impact. Don't complicate it with redneck engineering foolishness. Whip, rotation, and campfire knowledge won't defeat impact of forces like gravity.

If all factors are the same, heavier projectiles will always have "more drop".

[muzzlebrake]

Everything else the same...

If all factors are the same, heavier projectiles will always have "more drop".

But all factors are not and cannot be the same. There's this thing called drag coefficient. All bullets are not created equal
And then there is this guy that dropped some stuff of different weights off that leaning tower over in Italy and they both hit the ground at the same time but that was a few hunnert years ago so things might have changed since then with this new math they been teaching.

[meltingfeather]

If all factors are the same, heavier projectiles will always have "more drop".

This is not true if muzzle velocity is the same.

Marbles fall just as fast as bowling balls.

[TxAg]

I love this thread.

[bboswell]

Affects of bullet grain wt.

Everything else the same...

Additional projectile weight will = additional projectile drop in elevation at impact. Don't complicate it with redneck engineering foolishness. Whip, rotation, and campfire knowledge won't defeat impact of forces like gravity.

If all factors are the same, heavier projectiles will always have "more drop".

I looked at Hodgdons online load data and selected an average velocity for a bullet on each end of the weight range.

I then looked up advertised BC for each bullet.

That info was entered into Ballistic AE with Bullet weight, BC & FPS being the only variable.

100g bullet dropped 574.22” @ 1000 yards
180g bullet dropped 270.3” @ 1000 yards.



Tell me again who is complicating this with foolishness?

[ken800]

What in the wide world of sports...

Bullet drop is a function of

Velocity
Aerodynamic forces
Gravity (constant)

If your velocity is exactly the same and your ballistic coefficient (how well the bullet works against drag) is also exactly the same, bullet weight is not relevant. If you use something like the hornady ballistics calculator, you'll find a 200 grain bullet and a 100 grain bullet with the exact same BC and velocity will have the same drop.

SO, this begs the question: which falls faster, a pound of feathers or a pound of lead?

[Txhuntr2]

But all factors are not and cannot be the same. There's this thing called drag coefficient. All bullets are not created equal
And then there is this guy that dropped some stuff of different weights off that leaning tower over in Italy and they both hit the ground at the same time but that was a few hunnert years ago so things might have changed since then with this new math they been teaching.

This is funny.

[TxAg]

What in the wide world of sports...

Bullet drop is a function of

Velocity
Aerodynamic forces
Gravity (constant)

If your velocity is exactly the same and your ballistic coefficient (how well the bullet works against drag) is also exactly the same, bullet weight is not relevant. If you use something like the hornady ballistics calculator, you'll find a 200 grain bullet and a 100 grain bullet with the exact same BC and velocity will have the same drop.

SO, this begs the question: which falls faster, a pound of feathers or a pound of lead?

Thank you for being a voice of reason.

[ken800]

Thank you for being a voice of reason.

Sure thing!

I think I should add this:

As bullet grains (weight) goes up, space in the brass casing is reduced. The reduced capacity means a lower charge meaning a lower velocity and therefore more bullet drop. So, a heavier bullet very likely has more drop than a lighter one in the same rifle but it has nothing to do with the weight of the bullet "dropping faster".

Secondarily, most quality hunting loads are operating at or near peak PSI in the chamber per saami specs. A bigger bullet needs more powder to get it up to the same velocity and that usually means exceeding pressure limits so therefore the heavier bullets are loaded with less powder meaning less velocity. This is usually OK because muzzle energy is a function of velocity+mass so a lower velocity is offset by more mass. In other words, F=MA -- Newton's second law.

[tdwinklr]

What in the wide world of sports...

Bullet drop is a function of

Velocity
Aerodynamic forces
Gravity (constant)

If your velocity is exactly the same and your ballistic coefficient (how well the bullet works against drag) is also exactly the same, bullet weight is not relevant. If you use something like the hornady ballistics calculator, you'll find a 200 grain bullet and a 100 grain bullet with the exact same BC and velocity will have the same drop.

SO, this begs the question: which falls faster, a pound of feathers or a pound of lead?

But its NOT the same weight, its a 150 grn bullet and a 180 grn bullet. Drastically different if you weigh them on a beam scale or other. In the same caliber, the velocities will never be the same, even at the muzzle.
Do you think an object of 100 lbs vs. a 1 lb object will fly the same trajectory at 100 yds with the same muzzle velocity? NO.

[ken800]

But its NOT the same weight, its a 150 grn bullet and a 180 grn bullet. Drastically different if you weigh them on a beam scale or other. In the same caliber, the velocities will never be the same, even at the muzzle.
Do you think an object of 100 lbs vs. a 1 lb object will fly the same trajectory at 100 yds with the same muzzle velocity? NO.

An object of 100lbs with the exact same ballistic coefficient as an object of 1lb will fly the exact same trajectory if they are at the same velocity leaving their respective barrel.

And as you shake your head, and yell BS!, consider this before you do: To accelerate the 100lb object to the same velocity as the 1lb object you will need a LOT more energy, but that is your answer. You have accelerated two different objects with the same BC to the same velocity. The massive amount of additional energy you impart upon the 100 lb. object will give it the same trajectory. Period.

[ken800]

Here's some data for the naysayers on the whole feathers vs. lead...

Go here: it's a simple ballistic calculator that factors in all kinds of stuff. Just use the standard and stick with G1 ballistics.

https://www.hornady.com/team-hornady/ballistic-calculators/#!/

The item in question here is bullet weight in grains. Let's fill in the relevant blanks from two different bullets using the G1 drag coefficient table. You fill in three things: BC, Velocity, and Weight.

Woodleigh .62 caliber FMJ 900 grains BC=.334 1.282" length total
Speer .257 caliber SP 100 grains BC=.334 .954" length total

Plug both bullets into the calculator at 3000 FPS.

Both drop exactly 53.7" at 500 yards when put into the calculator. Why is this?

They have the same aerodynamic drag profile (BC)
They are traveling at the same velocity
Gravity is a constant

Please, for the love of God, please abandon the idea that "heavier" objects fall to Earth faster than "lighter" objects.

[ame="https://www.youtube.com/watch?v=KDp1tiUsZw8"]Hammer vs Feather - Physics on the Moon - YouTube[/ame]
Hammer and Feather on the moon...
+

[CBHunter]

Some of you guys are funny. If you open up your deer stand window and drop a bowling ball and feather, are they going to hit at the same time? Nope. Gravity may be constant, but there are other forces at work. We don't live in a vacuum.