I recently bought a Model 24 Classic in .44 Special, and a Model 27 Classic in .357 Magnum.
Been using cast bullets, and so far leading is not a real problem.
The .44 seems a bit less prone to leading than the .357 Mag.
I have not used very heavy loads in the .357 yet either, just target type speeds.
Both guns appear to be pretty accurate, no complaints there.
There are some minor differences on these, compared to vintage models.
The grips appear to be the same as used in the past at first glance, but they are thinner in fact.
I was able to put a pair of vintage grips on the .357 without any problem, but
oddly this was not the case with the Model 24. Vintage grips did not want to go
on without some fitting. I find this odd. Back in the day, I never had this problem.
The bores on both appear to have pretty deep grooves also, for what it's worth.
They also appear much smoother than vintage bores did. The lands look like
a mirror finish, very shiny.