Still in our family is an older (pre-safety, leather piston seal) HW30s (from Robert Law's Air Rifle Headquarters) that is still running fine on all original parts/spring/seals (!). Not a lot of power, but light to carry and fun so shoot. Could just be those lower-powered guns don't have near the problems of all the "Magnums" that came later?
When I go up in the mountains here in the winter, "icicle hunting" is always a ton of fun. Often, shots can be found/taken out past 50 yards.
Speaking of Robert Law's ARH, old-timers might even recall his magazine "A.R.M." (Air Rifle Monthly: not always about rifles, and certainly not monthly...): "Volume 5" just so happens to have an article about, of all things "a mid-winter icicle hunt". Must not have been many people out-and-about there in WV in those days as a photo in the article shows 3 people shooting standing right on the side of "a main highway" (and, shooting across the road; sure couldn't get away with that these days!). A sentence in said article states "You will find additional challenge in shooting at distances as great as 60 yards or more". Fun stuff!