If you don't want to dive into assembly yet (and thats perfectly fine, you pretty much need a full week of practice to start working with it), I made some aforementioned haxinator files to speed up and simply the process of editing weapons.
Heres the folder of all my files, you want the "Weapons" and "Bullets" folders in particular. Grab your copy of Boosters Lab, go into the Hacks folder and delete the old Weapons folder, then place these two in. Then when you open your mod in BL and open Actions>Hacking Tool, the new weapons folder will have files for all the weapons.
You'll see a spot to enter the bullet ID for levels 1-3 respectfully, and
you can find a list of Bullet ID's here by your truly.