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Common uses: Hunting, Varmint
| Type | rifle (centerfire) |
| Typical load | 100gr Federal Power-Shok Jacketed Soft Point (243B) |
| Muzzle velocity | 2960 fps |
| Muzzle energy | 1946 ft-lb |
| Published G1 ballistic coefficient | 0.355 |
| Case length | 51.9 mm |
| Overall length | 68.8 mm |
| SAAMI max pressure | 60000 PSI |
| Common twist rate | 1:10" |
| Range (yd) | Velocity (fps) | Energy (ft-lb) | Drop (in) |
|---|---|---|---|
| 0 | 2960 | 1945 | -1.5 |
| 100 | 2693 | 1609 | 0 |
| 200 | 2441 | 1323 | -3.3 |
| 300 | 2203 | 1077 | -12.5 |
| 400 | 1979 | 869 | -28.8 |
| 500 | 1769 | 695 | -54.2 |
At 1,000 yards, .243 Win. (100gr at 2960 fps, 100 yd zero, standard conditions) has a modeled come-up of about 39.8 MOA / 11.6 MIL, retaining 1052 fps (subsonic).
| Range (yd) | Velocity (fps) | State | Drop (in) | Elev (MOA) | Elev (MIL) |
|---|---|---|---|---|---|
| 300 | 2203 | Supersonic | -12.5 | 4.0 | 1.16 |
| 400 | 1979 | Supersonic | -28.9 | 6.9 | 2.00 |
| 500 | 1769 | Supersonic | -54.2 | 10.3 | 3.01 |
| 600 | 1576 | Supersonic | -90.6 | 14.4 | 4.19 |
| 700 | 1404 | Supersonic | -141.1 | 19.3 | 5.60 |
| 800 | 1256 | Transonic | -209.4 | 25.0 | 7.27 |
| 900 | 1139 | Transonic | -299.5 | 31.8 | 9.24 |
| 1000 | 1052 | Subsonic | -416.7 | 39.8 | 11.58 |
Extended predictions beyond 500 yards are modeled from the same G1 engine — useful for initial DOPE, but outside the 500-yard manufacturer-table validation audit. Confirm with observed DOPE, especially near transonic.
A retained-energy reference only — not a shoot/don't-shoot distance. Real effective range depends on your accuracy, shot placement, bullet construction, and conditions. The ~1,000 ft-lb (deer-sized) and ~1,500 ft-lb (elk-sized) figures are commonly cited rules of thumb, not standards.
Your barrel, ammunition lot, and conditions will differ — always verify against the manufacturer's data and your own rifle.
The .243 Winchester is one of the most enduring dual-purpose American cartridges, prized for the way a single rifle can switch between light varmint bullets and heavier deer loads. Light recoil and flat trajectory make it a popular choice for new and recoil-sensitive shooters, youth hunters, and anyone who wants an easy-shooting rifle that still reaches well past 300 yards. With lighter bullets it excels on coyotes, groundhogs, and prairie dogs, while 90- to 100-grain loads are a proven, humane choice for deer and pronghorn. Its main limitation is bullet weight: it is generally considered light for elk and larger game, where shot placement becomes especially critical. Decades after its debut it remains a mainstay in factory rifles and a staple on ammunition shelves.
Introduced by Winchester in 1955, the .243 Winchester was created by necking down the .308 Winchester case to accept .243-caliber (6mm) bullets. It was conceived as a dual-purpose round that could handle both varmints and medium game, drawing on wildcat experimentation of the era by writers such as Warren Page, who necked down the .308 shortly after its 1952 debut. First offered in the Model 70 bolt-action and Model 88 lever-action rifles, its standard 1:10 twist let it stabilize heavier deer bullets and helped it outlast the rival .244 Remington that appeared the same year with a slower 1:12 twist limited to lighter bullets.
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