Smoothbore vs Rifling

Smooth bore vs Rifled (in tanks)

So what I've got so far is that smooth bore guns have less friction and wear, and that the ammunition itself imparts it's own spin; using fins or some thing else - yes ?
 
It's been pretty much explained by people who use it.
Types of ammo work best under established criteria.

This is the result of long and varied types of testing done before something is ever fielded.
 
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