If you WANT a bang flow you must either:

shoot for shoulder with your SST

switch bullet to a FLAT Nose (elmer keith) bullet like a Nosler Partition or a Barnes MZ or something that is going to "splash" when it hit flesh. Think about it, when you drop a stone in water, what displaces more water a flat stone or a rounded stone? A flat one does, now do the same for a deer.

There are two theories of shooting inline MLers, slow and big and fast and small. In the east for shot < 100 yards I would claim slow and big makes sense. Out in the mid west and west were the shot are commonly 200 yards or better, small and fast is better. So if you wanna stay with the SST, then high shoulder and if you wanna go to a "back east killer" then shoot a bullet which is flat nosed, 300g or better, accurate as heck in your gun and penetrates at least 12". Your 250g is 50g light in my mind and the hard nose of the SST keeps it from "splashing big", look at the various wound channels in ballistic gel in these posts:

http://www.the-gleasons.com/SST,%20TMZ,%20XTP%20Bullet%20Performance%20into%20 Perma%20Gel%20by%20TheLeftHand.htm

which ones are wide and deep? Choose a bullet that will do the job your looking for. I know Nosler and Barnes MZ will do that based on personal experience, there are other bullets that will do that also and I am not excluding them, but those two are the best of the best for back east shooting.

Chap