Be good if Mauser made a 500 Jeffery barrel for the M03 ,maybe they think it would cut into sales of their M98 500 Jeffery ?, there was a fellow on AR, a German who was getting some German gunsmith to make up a 500 Jeffery barrel for his M03 ,the hardest part being cutting the locking lug recesses into the barrel ,i dont know if anyone in Aust would do it