I have submitted a reply about the Remington revolving rifles before,
They in themselves shoot well!
But, the flask back, spent caps, and lube bouncing off your face, certainly attributes to flinch, and poor groups.
To shoot the rifle safely, you must extend it like a pistol, then what is the point, you might as well shoot pistol.
The blast from the cylinder is painfull to the ear.
Plugs or protection MUST be worn.
I've had two of them, neat to hold, and point (empty) but painful to shoot as they were intended.
If I may suggest, take any one of the cap & ball revolvers, hold it to your nose, and touch it off.
If you can shoot all six chambers, in like manner, then you are ready for a revolving rifle.
Old Ford