Here's a slight deviation from the original question: Do any of you subscribe to the concept of picking and testing a defensive round, then finding a ball round that shoots similar and then trusting that the reps with the ball round will always translate to the defensive round?
I picked that up early in shooting after reading it off some blog, but I never actually peer-reviewed that concept. Assuming the defensive round you picked does feel reliably into your pistol as close to 100% as possible, is there any harm in that line of thought?
Meh, honestly most of it is close enough, unless the point of impact shifts a lot, or the practice ammo is really, really weak.