Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Remington Core-Lokt Copper 243 Winchester ammo bridges the gap between legacy terminal performance and modern lead-free mandates. At 3200 feet per second from a 24-inch barrel, this 85-grain solid copper hollow point load carries 1933 foot-pounds of energy to the target — retaining expansion characteristics that made Core-Lokt a 75-year standard in American deer camps, now engineered from a lead-free monometal projectile. For hunters navigating California condor zones, non-toxic waterfowl regulations extended to upland game, or state trust lands with copper-only requirements, this is 243 Winchester ammo purpose-built for compliance without compromise.
Built for the Box
The solid copper hollow point construction starts with high-strength pure copper rod stock, machined to a controlled-expansion cavity that initiates petal formation on impact with soft tissue. Unlike bonded lead-core bullets that shed jacket fragments, this monometal design retains 95-99% of its original weight through bone and muscle, driving a wound channel that mirrors the “deadly mushroom” expansion profile documented in decades of Core-Lokt field reports. Remington loads this projectile in boxer-primed brass cases with a lead-free primer compound — every component California Proposition 65 compliant from primer to projectile.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 243 Winchester |
| Bullet weight | 85 grains |
| Bullet type | Solid Hollow Point |
| Muzzle velocity | 3200 fps |
| Muzzle energy | 1933 ft-lbs |
| Rounds/box | 20 |
| Case | Brass |
| Primer | Boxer (lead-free) |
| Corrosive | No |
| Reloadable | Yes |
| Lead-free | Yes (projectile and primer) |
| Intended use | Hunting (deer, pronghorn, hogs) |
| Manufacturer | Remington (USA) |
This load sits at the lighter end of 243 Winchester hunting offerings — 85 grains versus the more common 95-100 grain copper projectiles — trading sectional density for velocity. The 3200 fps launch speed flattens trajectory inside 300 yards and reduces wind drift on pronghorn-sized targets in open country. Boxer priming and reloadable brass cases let handloaders tailor this once-fired brass to tighter velocity nodes or substitute alternative copper monolithics after the factory loads are spent. 243 ammo chambered in lead-free configurations typically costs 20-30% more per round than traditional cup-and-core loads — the copper material premium and California-compliant primer compounds drive the price delta.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle 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.
- Observe the four universal rules: treat every firearm as loaded, never point at anything you’re not willing to destroy, keep your finger off the trigger until ready to fire, know your target and what’s beyond it. See the full four rules of firearms safety.
- Verify current federal, state, and local ammunition regulations in your jurisdiction before purchasing — some municipalities restrict copper projectile loads or require additional documentation for non-toxic ammunition purchases.
- Lead-free ammunition generates different point-of-impact shifts and pressure curves than traditional cup-and-core loads — zero your rifle with this specific load before hunting season and confirm barrel twist rate compatibility (1:10″ or faster recommended for 85gr monolithics at 3200 fps).
Reviews
There are no reviews yet.