I would have to say an unequivical, 'maybe'. In most instances the cartridge stops could be lengthened to allow the longer round, but in some instances, notably the winchester m92 and it's clones, the limit may be built into the rifle. In actions such as the m94 winchester the 44 mag could be lengthened but you would be money ahead to simply buy a 444 marlin. In the 357/357 max conversion I would suggest the same with a caveat. The 357 max generates more pressure than the 357 mag. It may well be unsafe in some of the rifles so chambered.. So while it could be done sometimes, you would be wise to simply buy a different rifle already chambered in a caliber that covers the power level you are looking for.. good luck from the gunnut69