Seems like you\re asking about the difference between the single trigger and 2 trigger set-ups---basically thats the only real difference between the 2 models in my book---I have both and prefer the double for hunting,maybe the single would be better for trap/skeet .
The 212 and true 2400 are a bit lighter than the 412/512 series guns, which were a bit beefier inside the receivers to accommodate the 9.3X74R, etc. , but they are real similar for sure.
You can install a DT or SST in the 212 guns and the upgraded Savage 2400 with the better grade wood and cut checkering. The 212 guns have the plain wood and pressed checkering.
