I was working up some 180 grain bullet loads with Alliant 2400 powder in a Ruger Blackhawk Stainless with red dot scope on Sunday. I started at below the "max" powder level recommended by Alliant and finished up just over the max load. The pin backed out slightly twice while I was firing my 18 rounds of ammo of various hot but not extreme loads. It isn't a big deal as on mine, you just push the pin back in and everything is just fine.
I do like to check it periodically when I am shooting loads of the true magnum class.
I have looked at the websites for the replacement pins, but it hasn't been enough of a problem, that I have gotten around to order one, yet. From what I have read the pins, may require a bit of minor fitting.
Good luck!