Swaged vs cast

[10mm Witness]

What are the differences between swaging and casting a lead ball or cylinder? I am assuming by swaging the lead it is compacted and raises the weight slightly as more lead is inside the given area of the ball or cylinder. Is this the only difference? By compacting does it change the molecular structure?

[uncle dino]

Swaging doesn't make lead more dense, the lead will take the shape of the die via pressure, instead of being molten. Swaging typically will give you a more uniform ball, no sprue.

[Pipefitter]

Also with casting you get one shape and weight bullet from a mold, with swaging you get one shape (nose type) but any weight you want within reason. For instance I have a set of .452 swage dies that I can make any weight of bullet from 180 grains to 350+ grains. Same Keith type nose, just use a bigger core. Add a different nose punch and you could make round nose or HG 58 SWC's.
When you get into jacketed bullets the menu increases some, hollow points, lead round nose, TC, nylon or plastic inserts in the nose, harder lead base (in the jacket) with a soft nose for expansion, a jacket filled with #9 or #12 shot for 100% energy transfer in about 12". Also the ability to use inexpensive 40S&W brass for jackets.

[Utah Shooter]

Casting involves melting lead. Swaging is forming under pressure. Most swaged projectiles have a jacket and not lead showing.