Is a 25-Yard Zero Dead-On at 100 Yards?

by
posted on June 10, 2011
bs_2015_fs.jpg (4)

The Myth: A 25-yard zero puts you “dead-on” at 100 yards. I’ve listened to some pretty amazing ballistic theories over the years but this one is probably the most common. The theory is that, with common big game cartridges, a “zero” at 25 yards will correlate to a second “zero” at 100 yards.

The Ballistic Background: First we have to understand the concept of zero. Because a rifle’s sights are not inside the bore and a bullet’s flight path is subject to gravity, we must align our sight to intersect with the bullet’s path at a given distance. Generally, we consider the rifle’s “zero” to be the point at which the bullet’s path intersects the line of sight for the second time. In other words, if the bullet strikes the line of sight at 25 yards and then rises relative to the line of sight before falling and intersecting the line of sight again at 100 yards, we have a 100 yard zero.

Let’s look at a few common examples:

.30-06 Federal Premium 165gr. Nosler Partition 2830 fps (Factory)
25 yard zero=2.77 inches high at 100 yards

.270 WCF Winchester Silvertip 130gr. 3060 fps (Factory)
25 yard zero=3.0 inches high at 100 yards

.243 Winchester 100gr Hornady Interlock 2960 fps (Factory)
25 yard zero=2.9 inches high at 100 yards

Fact is,most common big game loads would be about 3 inches high at 100 yards. For hunting purposes it may be "close enough," but it's not "dead on" for most calibers.

The Conclusion: A 25-yard zero will put your bullet around 2.5 to 3 inches high at 100 yards depending on caliber, but it's not "dead on."

Latest

Pease And Venison Lede 2
Pease And Venison Lede 2

Recipe: Creamed Venison and Peas

Brad Fenson creams together peas and venison in this wild-game take on a British classic.

Airport Conversation Leads to Wildlife-Related Charges

CDFW officers catch a pair of poachers after overhearing them on a plane.

NRA Files Lawsuit Challenging Colorado’s Excise Tax on Firearm and Ammunition Sales

On March 31, the National Rifle Association of America (NRA), together with the Firearms Policy Coalition, Second Amendment Foundation, Colorado State Shooting Association, Magnum Shooting Center and an NRA member, filed a lawsuit challenging Colorado’s 6.5-percent excise tax on the retail sale of firearms, firearm precursor parts and ammunition.

Tested: Magnum Research 10mm Magnum BFR Revolver

This 6-shot, single-action revolver may well be the first factory-made handgun chambered in this caliber in over three decades.

Hunting Heritage Trust Grant Applications Being Accepted

The National Shooting Sports Foundation (NSSF), the trade association for the firearm industry, has opened the application period for the 2025 Hunting Heritage Trust Grants. They offer a total of $100,000 in financial support for programs that work to expand participation in hunting and the shooting sports.

Hardware Review: Marlin Model 1895 Dark

If you think lever-action rifles should only have walnut stocks and a blued-metal finish, then the new Marlin Dark series with its polymer buttstock and aluminum AR-esque handguard probably won’t be your thing. That’s a shame, because this recent offering in Marlin’s line of modernized, capable lever-action rifles has a lot going for it in terms of performance, functionality and fun.

Interests



Get the best of American Hunter delivered to your inbox.