They're definitely cool.

The modern 475 and 500 cartridges in light 3-1/2 pound guns are better

500JRH with 440 grains at 1350fps
475 Linebaugh with 420 grains at 1350fps
With these cartridges you're in the range of 1700-1800 ft/lbs energy

If it weren't for the "destructive device" regulations, we'd be building modern 577 revolvers too.