Okay, I'll try.
IF the cylinder exit is of a smaller diameter than the barrel, the bullet will end up "wobbling" as it goes down the barrel. This "wobble" effect will be seen on the target.
Ideally you want the bullet to exit the cylinder and have the forcing cone in the revolver "size" the bullet for the barrel.
But, if the cylinder exit is too larger, then you have other problems.
The secret is to have a happy balance between the cylinder, forcing cone, and barrel.
How do you check your cylinder? Go to Harbor Freight and pick up a cheap digital caliper that will measure the internal size of the cylinder exit area and barrel.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)