With the allmetal hotend you can override the default 260C°temperature limit to 300C°
You have to add these lines to the startup GCODE
M4003 S300; set limit 300C
M104 S300 ; start heating extruder to 300C
You can set the temperature 260-300C according to your needs
!!!!CAUTION IF YOU SET THE OLD CUHEAD TO 300C° IT WILL DAMAGE THE TEFLON TUBE INSIDE!!!!