To put this in perspective:
The concerns about the ability of SOME .44 Special guns (Smiths, Rugers, whichever) to fully seat & chamber SOME .44 Magnum rounds (factory OR handloads), lie in the fact that common sense SHOULD handle the situation, but we all know that Rex will try it anyway.
Note all the complaints across multiple Internet forums in initial discussions of the new Ruger GP .44 Special- "But, it AIN'T a MAGNUM!!!!!"
The issue is not a safety deficit in the gun, and the solution is not to take a (note "a") .44 Mag cartridge along to the gunshop & try it through several guns till you find one that won't fully seat it.
The issue is that the manufacturing processes inherent to both guns and ammunition are simply not precise enough in tolerances to make sure that NO .44 Special revolver will EVER chamber ANY .44 Magnum round.
The solution is to simply not try to shoot a .44 Mag load in a .44 Special gun.
As mentioned, most .44 Mag factory loads will NOT chamber fully in a Smith or a Ruger .44 Special, and you may have to look through several different brands & loads to find one that does.
I had to go through several .44 Mag boxes on the shelves here to find that one single Black Hills load that would fully seat with all five chambers loaded up out of that box.
Taking one .44 Mag cartridge along & trying it in however many different Ruger GPs a dealer may have in stock would tell you only that THAT cartridge would or would not fit in THOSE guns.
Not a reliable methodology.
In the meantime, these discussions are a cautionary advisory, and not a condemnation of Ruger or S&W.
The thinking man will avoid trying Mag loads in Special guns, recognizing that it's a "Just because I can, doesn't mean I should" situation, while Rex will carefully reason out that "Hey, they's ALL .44s. If it fits, it shoots, and I want more POWER!!!!!!!"
To reiterate for anybody still unclear- the GP .44 Special IS NOT DESIGNED TO HANDLE .44 MAGNUM PRESSURES.
Just don't try.