ALL COPPER, NON-TOXIC MADE WITH CUPROX MATERIAL SOURCED AND MANUFACTURED IN SOUTWEST MICHIGAN.
CuProX™ was engineered around one principle:
Real-world lethality is driven by physics - not just density.
Density matters. But drag, structural integrity, and energy retention determine what actually happens downrange.
Energy isn’t linear with speed - small differences in retained velocity create disproportionately larger differences in downrange energy. The real advantage doesn’t come from launching pellets faster. It comes from how efficiently they move through the air and how much energy they retain before reaching the target.
Drag begins working immediately.
Old muscle car guys used to say, “there’s no replacement for displacement.” And for a long time that was true. Today, modern engineering is producing twice the horsepower from engines with half the displacement - not by ignoring physics, but by using it more efficiently.
The same principle applies here.
For the same shot size:
• Steel (~0.50 Cd) often relies on higher muzzle velocity - for example, 1500 fps loads - but loses energy quickly due to lower density and higher drag.
• Boss Bismuth (~0.52 Cd) increases mass per pellet through higher density but carries more aerodynamic resistance and narrower velocity margins.
• CuProX™ with TurbuFlow™ (~0.44 Cd) reduces drag, preserves velocity longer, and improves retained energy downrange.
What started as a response to rising material costs became a catalyst for innovation. By engineering copper specifically for energy retention, flight stability, and consistency, we didn’t just replace bismuth - we built a more advanced non-toxic shotshell in the process.
This wasn’t about compromise. It was about turning a constraint into an advantage - and raising the bar for what non-toxic shotshells can be.
At 40 yards:
• CuProX @ 1350 fps→ ~18% more retained energy than steel @1500 fps
• CuProX @ 1350 fps→ ~5-7% more retained energy than Boss Bismuth @1350 fps
• CuProX @ 1500 fps→ ~50% more retained energy than steel @1500 fps
• CuProX @ 1500 fps→ ~15-18% more retained energy than Boss Bismuth @1350 fps
At 60 yards:
• CuProX @ 1350 fps→ ~40% more retained energy than steel @ 1500 fps
• CuProX @ 1350 fps→ ~8-10% more retained energy than Boss Bismuth @ 1350 fps
• CuProX @ 1500 fps→ ~65-75% more retained energy than steel @ 1500 fps
• CuProX @ 1500 fps→ ~30-35% more retained energy than Boss Bismuth @ 1350 fps
Real-world testing supports the model. In gel testing at 1500 fps, #3 steel at 40 yards produced approximately the same penetration as CuProX at 60 yards, highlighting how density combined with improved aerodynamic efficiency preserves usable energy farther downrange.
Not because density doesn’t matter.
Because efficiency multiplies it.
Shot Size and Efficiency
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The physics applies across all shot sizes - but aerodynamic efficiency becomes increasingly important as pellets get smaller.
Smaller shot loses velocity faster because drag affects it more relative to its mass. Reducing drag allows smaller shot to retain usable energy farther downrange, extending performance without increasing pellet size or sacrificing pattern density.
Larger shot naturally retains velocity better, but improved aerodynamic efficiency still increases retained energy and consistency at distance.
Density is a material property.
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Strength Without Fragility
Copper provides structural integrity that allows meaningful velocity without the brittleness long associated with bismuth.
CuProX pellets maintain geometry through acceleration and impact, preserving energy transfer and delivering consistent penetration without fragmentation.
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Performance as a System
CuProX is not simply a material change.
It was developed alongside Boss’s Warchief wad technology and controlled velocity windows to optimize pattern density, flight efficiency, and terminal performance as a unified system.
Because lethality isn’t defined by one variable.
It’s defined by how all of them work together.
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TurbuFlow™ doesn’t change physics.
It applies it.
Deadlier by Design.
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