110 is also very accurate in my Glock20, but the velocity isn't there - not enough room in the case. But, I've gotten 1" groups @ 25yrds with 180 plated [10mm].
Per a direct inquiry to Hodgdon, they are the same powder. Ask them yourself.110 and 296 are not the same powder. In my experience, 296 performs much better in the 357 than 110 and 110 does much better in the 44 than 296
For the record I'm using it in 44 mag