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I've done a good bit of looking into different ammo brands from manufacturers that produce hotter ammo than your standard Hornady, Federal, Winchester, etc and have found that almost all loadings with solid copper bullets have slower velocities than their copper plated lead counterparts. Is it that copper requires less velocity to expand? Do copper bullets not seal up the gases in the barrel as well as lead bullets? Anyone have any insight into why this is?
 

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I'll double check, but I'm pretty sure Corbon DPX has a higher velocity than most other rounds in varying calibers. Can't speak for other rounds, and why they might be slower.
 

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I haven't looked at any velocity data, but as a reloader I can tell you these things:

Copper is less dense than lead. A 115gr copper bullet is significantly longer than a 115gr traditional jacketed lead bullet.

Because the bullet is longer, there is less space for powder inside of the case.

Lowered internal volume of the case = Less powder = Lower velocities.
 

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I haven't looked at any velocity data, but as a reloader I can tell you these things:

Copper is less dense than lead. A 115gr copper bullet is significantly longer than a 115gr traditional jacketed lead bullet.

Because the bullet is longer, there is less space for powder inside of the case.

Lowered internal volume of the case = Less powder = Lower velocities.

But that presumes 9mm Luger is loaded to the gills with powder. Is that the case, generally?
 

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Yes, and the powder Cor-Bon uses may also be compressed a bit in the 9MM housing. I don't know but do have lots of them that function just fine in my guns.
 
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