My Delta Elite shoots "flat points" also. However, using a wide flat point lessens the reliability in any autoloader and further reduces it's penetration over a smaller meplat.
Is the 357mag always better than the 10mm? Of course not! However the 10mm doesn't have the penetration potential of the properly loaded 357 when dealing with the bigger animals.
When forced to go into the worse areas of town, I do pack the 10mm more often than the 357. When working around the place here, it's often the 357. Checking bait or if I know there's a sizeable bear passing through the property, it's not going to be either one of those.