223 Rem 55gr Solid Copper Fracturing Projectiles (Qty 50)

What this is

This is the 223 Rem 55gr Solid Copper Fracturing Projectiles (Qty 50).

This is the 55gr version of Blackout’s solid copper fracturing projectile for .223 Remington, sold as a bare component for handloaders, not loaded ammunition. At 55gr it sits at the lighter end of what most .223 reloaders run, which is deliberate: it is the weight that clears the widest range of factory twist rates without a second thought.

Twist rate and stabilization

A 55gr bullet is short for its caliber, so it stabilizes in slow twist barrels that would fail to spin-stabilize anything heavier. A 1:12 twist, the twist rate most older AR-15s and many budget bolt guns shipped with, handles 55gr reliably. A 1:9 or 1:7, common on newer builds, handles it with margin to spare. If you already own a 1:12 barrel, this is close to the top of your usable weight range rather than a safe middle choice.

Why 55gr specifically

55gr is the reference weight most .223 factory loads use, which means published load data for it is more abundant than for almost any other weight in the caliber. That matters more than it sounds: a bullet with three or four powder manufacturers’ worth of published starting and maximum loads is a bullet you can safely work up with, rather than one where you are extrapolating from a nearby weight.

Lead free construction

Solid copper means no lead core. On impact the design is built to fracture into fragments rather than mushroom as a single expanded slug, which trades penetration depth for faster energy transfer on varmint-sized game, the traditional role for 55gr in this caliber. Because there is no lead core, this also clears non-lead ammunition requirements where they apply.

Frequently asked questions

What twist rate do I need for this weight? A 1:12 twist is the practical ceiling for reliable stabilization at 55gr; anything faster (1:9, 1:8, 1:7) has margin to spare.

Is this bullet lead free? Yes, solid copper construction with no lead core.

Do I need different load data for a copper bullet versus a lead-core bullet of the same weight? Yes. Copper is less dense than lead, so a copper 55gr bullet is physically longer than a lead-core 55gr bullet, which changes seating depth and how it engages the rifling. Always use load data published for this specific projectile.

Related reading: our 8.6 Blackout ammunition and 300 Blackout ammunition categories, or the ballistics calculator if you are working out trajectory for a load using this bullet. Reference: SAAMI publishes the pressure and dimensional standards this caliber is built to.

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