Basic basics, or what I wish someone had told me half a year ago

The secondary fire mode loads up to four missiles into the gun as long as you keep secondary fire button pressed, and fires them all at once with high spread upon release or when you press primary fire button.

BTW by that:

You can unload hagar's preloaded rockets in secondary mode by pressing primary fire while still holding down secondary.

I meant to say rockets are NOT fired. You press primary, if time to involuntary shoot rockets is coming or you get tired of holding alternate fire down. After that, you can load them again.