We always use 4-11/16 boxes with 2 gang mud rings.
I normally form the wires into the locations of the terminals of the receptacle then cut to length. Pull the wires out of the box enough to terminate the receptacle then push the receptacle into the box. Usually there ends up being 8-10" of wire in the box.
Last week I received a phone call in the evening that the appliance installers were going to be onsite the next morning so I needed to get the range receptacle installed first thing. Supply house was the opposite direction from my house as the job site so decided to stop at HD and pay twice the price for a 14-50 receptacle.
This was the first time I have used a Leviton receptacle in many years. I didn't realize they redesigned their large receptacles so the wires enter the back instead of the side. In my opinion this makes the device much harder to install. Not only was pushing the receptacle into the box harder, I had to keep double checking the connection screws since they are not marked on the back and don't match the location of the prongs. They could at lease mark the EGC-green, neutral-silver and hots-brass.