Generally speaking, I believe the theory is to practice with rounds that duplicate the 'feel' of your defensive rounds: recoil, POA/POI, bullet weight, velocity, etc. If you take a look at the Speer Lawman ammo, for example, it's made to (supposedly) mimic all of the characteristics of the Speer Gold Dot Hollow Points, so you can practice with the cheaper, FMJ Lawman ammo, and get the same 'experience' as shooting with the GDHP.

As for rifle, I'm not familiar with a particular brand that does the similar idea as the Speer Lawman mentioned above, but it seems the same principle could apply.

Hope that made sense...