slugs
 

How much gun powder is in a 3 inch slug and a 2 3/4 inch slug?

RE: slugs
 

It all depends on the brand of slug.
Also next year or last year the manufacture may have changed powder . They just want the slug to go a certin FPS and be a safe chamber pressure

RE: slugs
 

Considering there is close to dozen manufactures (distributors) of "shotgun" type powders and dozen of suitable powders, with different burn rates, somewhere between 15 and 28gr of something or another.

Scratch that previous statement, I saw Herco loads from 36gr to 49gr with 1oz rifles slugs.