This is how you bend 3/0 into an LB

Shoehorn for your wire? The LB Wire Guide makes a 200 amp service a one person job. Jam it into your 2" LB and your wires slide right in, no need for pre bending. Prevents scuffs to your insulation and keeps your skin on your knuckles.

[crookeddonald]

I tie the wire to the hitch of my truck usually and it does the job. I do tear the entire wall out sometimes though.

[RocanMotor]

Have you tried cursing at it? Usually doesn't help, but it's my go-to method.

[AntonioRamirez-xgce]

Just cut a left over peice of your pvc you used in half and its free ! Done it plenty of times