Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Winchester Super X 223 Remington hunting ammo loads a 55-grain Jacketed Soft Point bullet to 3240 feet per second from a 20-inch barrel — enough velocity to flatten prairie dogs at 200 yards while delivering controlled expansion on coyote-sized targets. The 223 Remington cartridge, a civilian adaptation of the 5.56×45mm NATO round, operates at lower chamber pressures (55,000 psi versus 62,000 psi) and delivers match-grade accuracy in bolt-action varmint rifles and AR-15 platforms chambered specifically for 223 Rem. This load bridges the gap between range fodder and dedicated varmint rounds, offering terminal performance that expands rapidly on impact without the jacket separation common in ultra-thin FMJ bullets.
Built for the Box
The Jacketed Soft Point design features a lead core with an exposed nose cavity, allowing the bullet to mushroom on contact with tissue while the copper jacket controls expansion and prevents core fragmentation. At 3240 fps, this 55-grain projectile carries 1282 foot-pounds of energy at the muzzle and maintains supersonic velocity past 400 yards — critical for clean kills on varmints that won’t sit still for a second shot. Winchester uses boxer primers in reloadable brass cases, allowing handloaders to resize, deprime, and reload these cases multiple times with standard small rifle primers and powders in the 23-25 grain range (Varget, CFE 223, or IMR 8208 XBR work well). The G1 ballistic coefficient of 0.197 is typical for flat-base soft points in this weight class — sufficient for varmint ranges but not competitive with boat-tail match bullets at 600+ yards.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 223 Remington |
| Bullet Weight | 55 Grains |
| Bullet Type | Jacketed Soft Point |
| Muzzle Velocity | 3240 Feet Per Second |
| Muzzle Energy | 1282 Foot Pounds |
| Rounds/Box | 200 (10 boxes of 20) |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| G1 Ballistic Coefficient | 0.197 |
| Intended Use | Varmint and Small Game Hunting |
| Manufacturer | Winchester |
This load sits at the light end of the 223 Remington hunting spectrum — heavier 62-64 grain bullets offer better wind deflection and penetration on medium game, but the 55-grain JSP excels on thin-skinned varmints where explosive expansion matters more than deep penetration. The 200-round case format (10 boxes of 20) keeps per-round cost lower than buying individual 20-round boxes, making it practical for high-volume prairie dog or ground squirrel hunts where shooters may fire 100+ rounds in a morning session. For more Winchester 223 ammo options, compare this JSP load to Winchester’s 55-grain FMJ training rounds or 64-grain Power-Point hunting loads.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it is loaded. Keep the muzzle pointed in a safe direction at all times. Keep your finger off the trigger until your sights are on target and you have made the decision to fire. Be certain of your target, your backstop, and what lies beyond — review the Four Rules of Firearm Safety before handling any ammunition.
- State and local laws restrict ammunition sales and possession in certain jurisdictions — verify current regulations in your area before ordering. Some states require background checks, permits, or identification for ammunition purchases.
- This ammunition contains lead, a chemical known to the State of California to cause cancer and birth defects or reproductive harm. Wash hands thoroughly after handling ammunition or spent casings, and follow all state and federal guidelines for lead exposure prevention.
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