Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Winchester Copper Impact 243 Winchester ammo is a lead-free hunting load engineered around a monolithic solid copper Extreme Point hollow-point bullet with a polymer tip that initiates expansion on impact. At 85 grains, this bullet achieves 3,260 feet per second muzzle velocity and 2,005 foot-pounds of muzzle energy, producing flat trajectories and delivering rapid energy transfer on medium game animals including whitetail, mule deer, pronghorn, and smaller-bodied elk. The solid copper construction retains nearly 100% of its weight through bone and tissue, creating consistent wound channels without fragmentation. Hunters in California and other jurisdictions requiring lead-free ammunition will find this load compliant, and those prioritizing maximum weight retention over expansion diameter will appreciate the engineering behind the monolithic design. Each round is loaded in reloadable nickel-plated brass with a non-corrosive Boxer primer.
Built for the Box
The Copper Impact bullet features an extended ogive and boattail base to improve ballistic coefficient (G1 BC 0.344), flattening downrange trajectory and reducing wind drift. The polymer tip protects the hollow point during feeding and initiates hydraulic expansion upon contact with soft tissue. Because the bullet is machined from a single piece of copper rather than a lead core jacketed in copper, it retains structural integrity through heavy bone, maintaining penetration depth even on quartering-toward shots. Winchester engineers the bullet length to stabilize in standard 243 Winchester twist rates (typically 1:10 or 1:9.125 in factory rifles), and the nickel-plated brass case reduces friction during extraction in both bolt-action and gas-operated platforms.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 243 Winchester |
| Bullet weight | 85 grains |
| Bullet type | Polymer Tip (Winchester Copper Impact) |
| Muzzle velocity | 3,260 fps |
| Muzzle energy | 2,005 ft-lbs |
| Rounds per box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer (non-corrosive) |
| Corrosive | No |
| Lead-free | Yes |
| G1 ballistic coefficient | 0.344 |
| Intended use | Hunting (medium game) |
| Manufacturer | Winchester |
This load is optimized for deer and antelope at ranges from 50 to 300 yards, where the high velocity and rapid expansion produce clean kills with proper shot placement. The solid copper construction means you sacrifice some initial expansion diameter compared to conventional cup-and-core bullets, but you gain deep, straight-line penetration and exit wounds that leave clear blood trails. Use this ammunition where state or federal law mandates non-lead projectiles, or where you hunt in condor range and want to eliminate lead exposure to scavenging wildlife. Browse the full inventory of 243 ammo for additional grain weights and bullet styles suited to varmint shooting or long-range paper punching.
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.
- Always observe the four universal rules of firearm safety: treat every firearm as if it is loaded, never point the muzzle at anything you are not willing to destroy, keep your finger off the trigger until your sights are on target and you have made the decision to fire, and be certain of your target and what lies beyond it.
- Verify current state and local ammunition regulations before purchasing — some jurisdictions impose additional restrictions on ammunition sales, possession, or use.
- This product contains copper and other materials known to the State of California to cause cancer and birth defects or other reproductive harm under Proposition 65. Store ammunition away from heat, moisture, and direct sunlight to preserve powder stability and primer integrity.
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