Retail on the Marlin .357 Cowboy is over $700, so if you have one unfired, in the box it should be worth at least $600.

I have a Marlin .357, it feeds all .38 Special/.357 ammunition, but favors .357 for smooth feeding and accuracy. .38 Special lead semi-wadcutters feel very "clunky" when chambering, and give poor accuracy.

.38 Special lead round nose feed OK, accuracy is OK but not as good as 158 grain lead round nose or jacketed bullets in .357 cases. I can get 1.5 inch groups at 50 yards with 158 grain jacketed ..357 magnum hand loads.

I really like my Marlin .357, makes a good companion to my 4" Model 66 revolver...