my informations are from http://www.waffenhq.de
they say that the first gun was named Dora, while the second gun was named Gustav. Im sorry if im wrong but thats the only good site in german i know
My site says that the planned Barrel Lifetime was about 100 Shoots, but in practice after 15 shots strong manifestations of wear already showed up.It goes on telling that Gustav fired over 300 shells at Sevastopol
And they also say the gun only fired 48 shots
please correct me if im wrong
Greetz Dennis