Originally Posted by Vincine
Given the same caliber and same load of powder, a heavier gr. bullet will be less affected by wind over distance, but have more of a trajectory drop than a lighter gr. bullet, which would be more affected by wind, but less affected by gravity.
You'll need this for the quiz on Monday.
No, the quiz starts now.
That is an incorrect statement.
1.)Weight is not what cuts wind. Simple answer, better aerodynamics cuts wind better.
This is a link to Hornady's ballistic calculator.
(Use the advanced version.)
I'm going to use a generic load as an example, which happens to be my 357 hunting load.
I use a Hornady 180gr HP-XTP with a ballistic coefficient of .23, at a velocity of 1050. The sight height is .7, wind speed of 10, a 100 yard zero with a 200 yard max range; leave everything else as is.
Note the wind drift at 200 yards, 9.5 inches. Now switch the bullet weight to 280grains and calculate. The wind drift is still 9.5 inches.
Put the initial settings in and change the ballistic coefficient to .3 and calculate. The new drift is 7.5, 2 inches less.
A bullet with the same ogive,[the curve of the nose,] that is heavier; is more aerodynamic than its lighter counterpart.
2.) Drop is not subject to weight either. The reason the heavier bullet drops more, is because it is usually traveling slower; it takes longer to get to the target, whereas all bullets fall at 32 feet per second per second.
Another example; put in the initial settings on the ballistic calculator again, then note the 200 yard drop, 37.1 inches. Now up the weight to 280grains and calculate. The drop is the same 37.1 inches.
Now put in the initial settings and change the velocity to 850. The drop is 53.6
Wind at a specific speed as well as gravity are constants that deal with time, so speed is a factor as well as aerodynamics in drift and drop, but weight in and of itself, has no effect.
I might as well mention that, if all other conditions are equal, an increase in bullet weight increases energy.
Again, use the initial calculator readings and note the energy, 317ft-lbs at 200 yards. Up the bullet weight to 280 and you have 494ft-lbs of energy; 177ft-lbs more than the lighter bullet.