4150 Speeds and Feeds

I'm turning 6" 4150 and my feeds seem alright but id like to know if there is room to go faster and thin the chips a little.

Currently I'm running 850 rpms with .01228 in/rev and only taking .025 off the face a pass, is this conservative and i should let it rip or can i crank it up?

The machine is the MazakQT15n I've posted about a few times


Thanks for any input