I know the Fiocchi loads are around 880FPS which is pretty hot, with jacketed bullets to match, the pressures must be pushing it.
I'v heard of CGN members running up to 4.0 GR's of Unique through them but I wouldnt recommend it.
3.5Gr's is still fairly hot but safe in good condition Mle 1892's, I'v loaded a dozen 3.5gr loads with no issues, using lead cast bullets however.
Some newbies here may not realise that these Revolvers only lock up tight when the hammer is cocked back and the trigger is pulled.
It raises the hand slightly higher indexing the chamber to bore and locking up tight like a vault.
They may appear very loose when cocked, don't be alarmed, if you hold the hammer back with your thumb while pulling the trigger you see they are very solid mechanically.
Even a century later, most of these revolvers lock up better than a new factory gun.
The French had superior quality metals for the period and it shows!.