My friend's Security Six.
Back around 1981, my shooting buddy bought one new in stainless steel. I got to shoot it and it seemed OK. I had a used S/W model 28 with a trigger job, and my other buddy had a Dan Wesson with a long barrel, all three guns were chambered in .357 magnum. We went to a farm in the country and spent hours shooting. Was quite an experience to see how all 3 performed.
Had read at that time that stainless steel was a problem, galling in semi-auto pistols and the Security Six's had cracking in the forcing cone, although my friend's pistol had no issues, although he died a year later and the gun was sold in the estate. The prior posts here state that they have shot theirs for many years with no cracking issues.
However, I bought a new GP-100 in 2002 and made sure it was the blued carbon steel model as I was leary of the stainless, but I think they have worked out the issues now. I left the original springs in my Ruger GP-100 with 10 years of shooting mostly .38's and when I finally did spring work on all my Ruger revolvers the GP-100 did not need much work as it was well broken in, as I suspect yours will be too.
It would be interesting to do an online search of the supposed "cracked forcing cones", perhaps this was an old wives tale from the old days?