As standard the Loadmaster comes suitable for 12 and 16 bore cartridges holding 40 and 44 cartridges respectively.
However, with the addition of Loadmaster speed loader inserts they can be adjusted for 20 and 28 bore calibres.
To allow your standard loadmaster to take 20 bore cartridges two inserts are added to the outer walls of the chambers, for 20 bore you need one pair of inserts
To allow your standard loadmaster to take 28 bore cartridges four inserts are added to the chambers, two to the outer walls of the chambers, and two to the inner walls, for a 28 bore you need two pair of inserts.
All of the inserts are removable so they can be taken in and out as people swap guns