How would i go to make a weapon with multible projectiles

I have seen many tutorials on how to make a shotgun, and the shotguns in these tutorials shoot a certain number of projectiles with inaccuracy enabled.

What i want to do is kinda like the multishot enchantment, i want to have 5 bullets, spawning at the same place, with each of the bullets going out 5 degrees from the middle one, one 5 degrees left of the middle one, and one 10 degrees left of the middle one, with the same pattern on the other side.

How would i go to do a weapon like this?