Yeah they look like Winchester or Remington JHP. I checked their site and they are using Winchester or Remington JHP on other calibers. Seems kinda typical from DT for the last few years. You do not know what you are going to get.
The 115gr Winchester JHP, just slightly shorter than the 124gr. http://www.midwayusa.com/product/139...d-hollow-point
With Winchesters quality over the past couple years I would not be surprised if the bullet is undersized. I pulled a bullet out of WWB .357sig ammo and miced the bullet and it measured .353".
The description does say Sierra but the bullets in the pic sure do not look like Sierras. Guess if you want them right you have to load them yourself.