Defence Force says army's own experts have given all clear but no explosives will be used.
Fire chiefs are angry the army will start live firing again today at the scene of last week's big blaze at West Melton in Canterbury.
The first fire bosses knew of it was when they read it on news websites yesterday, they said.
Lincoln Volunteer fire chief officer Kevin Greene said, "It's mindblowing. They are a bit stupid really, continuing with the live firing. I understand they have got to train, but there's a fine balance. Fire risk is still high."
There is a total fire ban in the Selwyn District. The principal rural fire officer there, Wilson Brown, said the army did not tell him about live firing resumption.