About 1970, a US AID operative named Harry Archer (now deceased) took one of those nickel three-inch M-19's to a South American country. Also had a M-60, which he handloaded hot. He wrote articles about this for the now-defunct, "Gunfacts", edited by Ken Warner.
The guns accounted for animals up to capybara, I think, including brocket deer. Archer told me privately that he also found the gun useful to impress an ex-Nazi who hated him.
The three-inch M-19's were made mainly to fill an order from the French President's protective detail. Archer got his nickled one from a friend at the S&W factory. Most were blued.
BTW, the wet climate in the jungle damaged the nickel finish, but had no effect on the stainless M-60.
There have also been some three-inch M-66's, and I suggest one of those stainless ones for actual use, especially in humid areas.