Here is some information I received from Cooper about six years ago when I had a lot of Questions about Actions , Barrels , and Stock Finishes . This should clear up why certain Cartridges disappeared from the Model 38 . I had heard it was because the Model 38 Action was not as "Strong" as the 21 . I was told by one of the three Technical Reps. that it had nothing to do with Strength , but was due to two different Bolt Lengths that were required for the Hornet and Fireball based Cartridges with the Model 38 Action . Therefore it was strictly a financial decision . I was also told that PPC's were dropped in the Model 21 because this also required extra cost in that the Bolt Face had to be "manually" opened up , but that you could still Special Order the PPC's ....but don't know if that applies today . So you guys that own a Model 38 Fireball Type Chambering should rest easy .