I mispelled the name of this game. But I'm not alone...
You need a copy program that can ignore error, in particular on track $06.

Use a disk editor and look at:

track $01 sector $06 byte $08 change $03 to $62
          sector $0A byte $5A change $D0 $A7 - BNE to $EA $EA - NOP NOP

Bonus:
max 99 ammo
track $1D sector $09 byte $BF change $75 $50 to $99 $99
                     byte $D1 change $25 $15 to $99 $99
                     byte $E3 change $15 $10 to $99 $99