Dave T said:
When the loading manuals say "TC Contender or Ruger" they are talking, for the most part, about the Blackhawk.
If you re-check your loading manuals, you will notice the "TC Contender or Ruger" is refering to 45 Colt. The original 45 Colt was loaded to a very low pressure (SAAMI 14,000 psi) and most guns were never designed to handle the additional pressures of the hot 45 Colt loads (25,000+ psi).
Revolvers in .357 mag. were designed from the beginning to handle the maximum design pressure. You should NEVER exceed the maximum listed pressures in a .357 mag. no matter what gun you are shooting. Any revolver, including Blackhawks and Redhawks will shoot loose if you put enough rounds through them. Some just take longer than others.
The hardest loads on any revolver are the light 110 and 125 grain bullets loaded to the highest velocities. In addition to the wear caused by the high pressures, they suffer "flame cutting" of the top strap at the front of the cylinder from the excessive flame from hot loads. This is one reason why Ruger discontinued the Blackhawk in .357 Maximum. People kept loading 110 and 125 grain bullets to insane velocities and the guns were wearing out from flame cutting.
As long as you don't intend to put thousands of maximum loaded light bullets through your S&W 28, don't worry, it should last many years. If you plan on firing thousands of the maximum light bullet loads every year, any revolver you buy will wear out quickly, even a Redhawk.