The Model 83 was first released in 1983 and as others have stated, it is the heavy frame built stout for the 454 Casull. The Model 97 was first produced in 1997 and, again, is more on the lines of a Blackhawk, framewise... lighter than the Model 83 and not as stout, but a very fine revolver.

I have the Mod 83 in Casull with the 7.5 inch barrel and a Model 97 in 357. Both are the 'field' grade.

My g8-g8 uncle was Barney Riggs. Google and read about him. He roamed around the southwest, mainly west Tx and Az and NM territory. History credits him with from 9 - 12 men he killed, not counting Mexicans and Indians. Family lore has it at 18.