The "chamfers" are there to give the bolt a fair chance of getting to full depth in the notch when the gun is cocked very fast. Also to prevent rubbing a line in the cylinder if timed fast enough to do it.
Consider the cylinder is rotating at a high rate of speed and the bolt has to snap in place and stop it in it's tracks.
All the force is applied on the side opposite the chamfer to stop the rotation, so the "chamfer" isn't doing anything but good.
Remington was mostly alone in thinking it wasn't necessary.
Colt, S&W, Merwin, Hulbert, and all other revolver manufactures thought it was not only a good thing to do, but absolutely necessary.
Now, back to your problem.
It seems the most likely cause is, all your bolt notches in the cylinder are not the same width.
The cylinder stop (bolt) must be pre-fitted to the smallest notch before you do anything else.
You may need to stone the width of the tip of the bolt so it will enter the smallest of the six so it will drop to full depth in all of them.
Yes, that will make it slightly looser in the bigger notches.
But your gun will work properly when you get done.
rc