Aluminum Bullets

[SandRoad]

Any chance of the AL igniting in the barrel like magnesium from the friction ?

You are thinking of aluminum powder that is used in some pyrotechnics. The difference is that powdered aluminum has a huge surface area (surface of each tiny particle) relative to its weight and the weight of each particle is tiny, so each particle can heat up very quickly to its ignition temperature.

(solid => liquid => gas + ignition => boom)

Doesn't happen with a bullet.

 

[tootall]

Bismuth: $12 to $16 per pound.
Lead: $1 per pound.
Aluminum: $1.30 per pound
Copper: $3.50 per pound
Tin: $7 per pound

Boomer - pewter is around from 80 to 98% tin

Holy crap! I guess that wont happen then.

 

[Garand]

I believe the blue TP projectile for the 20mm are aluminum.

The 20mm TPT projectile consists of a hollow steel body shaped and resessed to receive the nose and a tracer. The nose which is made of aluminum, is solid and keyed to the body by swaging.

The 20 mm TP projectile consists of a hollow steel body and a solid and a solid aluminum nose which is leyed to the body by swaging.