The Highway Patrolman is an N-Frame. This is the same frame S&W used to build the .44 Magnum, which produces far higher pressures than the .357 Magnum. Obviously handloads can be produced that are way too strong, but absent that you should be able to shoot this revolver for a very , very long time with factory loads or sane handloads without ill-effect.
You don't tell us what vintage this one is. In the yoke it should say M0D-28. Is there a dash after the 28? This will have some effect on value and desirability to a collector.
The HP is a great revolver. I have picked up two M28-2s this year, both 4 inchers. I have an IWB holster on order and look forward to carrying them. Oh, and post a picture if you can. We like pictures.
Jim