Another data point.
Just finished my Instructors recertification last week using my Mdl 13-3. 700 rounds of Freedom Munitions 158 and 125 grain FMJ down range over three afternoons and an evening shoot. The gun ran like a champ. The only issue was the hole worn in my trigger finger.
When Smith changed their trigger to a smooth faced version they changed the upper geometry as well and I usually end up with this issue after heavy sessions. Once I got back home I rounded/softened the area that caused the issue.
This makes the 6th instructor level course I have taken with Smith Revolvers:
1979 - Mdl 14 using lead rounds of the time
1997 - Mdl 686 using FMJ rounds provided by the school
2007 - Mdl 19 using American Eagle 158 Grain Lead Round Nose
2010 - Mdl 19 Using reloaded 158 Grain Plated Bullets
2013 - Mdl 686 using 158 grain Molly round nose bullets
2013 - Mdl 13-3 using the Freedom Munitions mentioned earlier.
All these schools were 600 plus rounds and I cannot remember having to do any maintenance on the guns during the schools.