I load for both 44 Special and 44 Magnum, and IMHO the absolute best reference for Special handloads is Brian Pearce's piece,"Handloading the 44 S&W Special" in Handloader #236, August 2005. He lists three sets of data categorized by pressure (<15.5K PSI, <22K PSI, and <25K PSI), and then in the text states the classes of revolvers in each pressure range.
Since the OP is shooting an N-frame 44 Mag, any of the loads listed in this article will be safe. Although, Pearce (and I) believes that light loads for 44 Magnum should be reloaded in Magnum cases rather than Special cases.
Other posts in this thread have discussed the Skeeter Skelton load of 7.5gr Unique under a 250gr Keith LSWC. Pearce places this load (7.5 - 8.5gr Unique) in Category 2, <22K PSI. Loads in this category are suitable for almost all modern-manufacture revolvers, excluding the S&W New Century, 2nd Model Hand Ejector, and all Colt SAA clones.
Many reloading manuals appear to be over-cautious with 44 Spl load data out of respect for the older and weaker revolvers still being used. It seems to me that the Spl can be regarded as the .45 Colt has come to be regarded - that in revolvers built from modern steels and also chambered for other high-pressure cartridges, handloading to higher than SAAMI-recommended pressure is permissible.
In any case, I can't recommend Pearce's article enough. My copy is so dog-eared now that I'm thinking of buying a reprint and laminating it!