With Rugers big parts inparticular the cylinders it takes alot to get em going & alot to stop em !
If this GP was used primarily for speed shooting most likely the ejector & pawl was worn & latch notches beat out , now lets look at the other major components like the crane & cyl & the point where endshake is controlled .
Worn to the point where squaring it up would call for too many bushings (as there thin & wear qwikly)
Frame possible damage at the latch slot from stopping the cyl qwikly , cyl stop worn
Barrel throat erosion & they see possible metal fatigue around the barrel area that would render the frame unsuitable when installing a new 1.
& shooting 38 ammo does`nt matter ,ya can do the same damage sitting in the easy chair dry firing it
Trigger/hammer sear wear .
I did the same thing to a Colt Python , I paid .
I did the same thing to a S&W 586, I paid
Wish I was young enuff to try it on a GP100 !!
All GP100s are GP100s the model numbers for the 4" is 141, 6" 161
& I`m not Biased !!! I like all Rugers