If you did it right you will have ridiculous speed for a second, and by binding your gun to a hotkey you can bring it up again and repeat the process for fast chaining.
Then simply bring up the gun, move in a direction, swap ammo and bring up the pipboy, unequip the gun and bring the pipboy down again (Whilst still holding the movement key). To perform the glitch, get a weapon with a one-by-one bullet reload animation (.357 Magnum Revolver, Cowboy Repeater, Hunting Shotgun etc) and two different ammo types that fit the weapon.
Reload Dashing is a Fallout: New Vegas glitch that allows you to slingshot yourself in a direction very fast.
