Why Does Ballistic Coefficient Improve With Heavier Bullets?

by
posted on May 25, 2019
bc-qanda1.jpg
A reader submitted a question about why heavier bullets have an improved ballistic coefficient (BC) over ones that weigh lesseven with identical designs.

Q. I’ve begun reloading and have noticed the ballistic coefficient of identical-diameter bullets (.223 Remington in my case) increase with heavier bullets. With identical designs and same frontal area being pushed through the air, it doesn’t seem to make sense. Why does the ballistic coefficient improve with more weight?

A. All other things being equal, the added weight increases the bullet’s length and the sectional density of a bullet. Basically, that means less wind drift. Bullet mass plays a part in wind drift and for a competitive shooter, that’s probably enemy number one.
—Paul Box, ballistic technician, Sierra Bullets

The Sierra Bullets Blog also has a wealth of useful information on this subject. For example, the "Bullet Selection 101" article has helpful tips for selecting projectiles with regards to BC characteristics. Although it is a few years old, the information within is still relevant. See below for an excerpt.

"Sheer accuracy of a bullet with low ballistic coefficient characteristics can be outperformed by a slightly less accurate bullet in your gun system. If the bullet has a higher ballistic coefficient design and the wind conditions cause the less efficient bullet to drift enough more to overcome the accuracy differentiation you will experience better groups or higher scores with the slightly less accurate yet more efficient bullet."

Another great resource is the series of articles that our friends at Applied Ballistics have available for free on their website. You can learn more about these articles here. Be sure to grab a cup of coffee (or a beer), because you are probably going to want to read all 37 of them.

Please submit your questions to [email protected].


Lead photo (Berger 175-grain Tactical .308 Win.) courtesy of Applied Ballistics.

Latest

50Thanniversary SA M1A 3
50Thanniversary SA M1A 3

New: Springfield Armory Limited-Edition M1A 50th Anniversary Rifle

Springfield Armory celebrates 50 years of making the M1A with a special limited-edition model that combines historic significance with modern craftsmanship.

New: MDT Cyke-Pod Case

MDT describes this new case for its Cyke-Pod rifle bipod lineup as a “practical and sturdy carrying solution.”

Results: 2024 USA Shooting Rifle And Pistol Nationals

Rifle and pistol champions were crowned at 2024 USA Shooting Rifle & Pistol Nationals, a week-long event that brought together competitors of all skill levels at Ft. Moore, Ga., Jun. 24-30.

Pistol And Smallbore Only: 1947 National Matches

At the 1947 National Matches, Army shooter Joe Benner became the first competitor at the NRA National Pistol Championship to score more than 2600 points in the three-gun aggregate.

2024 Daisy BB Gun Nationals: Promoting The Spirit Of Competition

At the Daisy BB Gun Nationals, young people shoot and compete with the involvement of adult coaches and families, making it a truly inspiring event. The 2024 competition was the biggest in its 57-year history.

Third Annual Remington Shoot To Cure Fundraiser In Arkansas This September

Remington Ammunition’s 2024 Shoot to Cure sporting clays fundraiser to benefit children’s hospitals and disease research will be held in Lonoke, Ark., on Sept. 20.

Interests



Get the best of Shooting Sports USA delivered to your inbox.