You could always make up a dummy round or two , no primer , no powder , to safely test feeding and chambering in the rifle ... Lever guns tend to set their own rules ... seat the bullet in the crimp groove , if it will not feed and chamber a 44 magnum case ...try a 44 special case . Once you determine what will feed and chamber ... start looking at powder charges .
If you have a inertia bullet puller you can pull the bullets and still load the cases of the dummies ... I tend to keep my dummy rounds for testing in other guns and for setting seating and crimp dies .
Gary