In most instances of dents, they are of no concern...pictures would have helped.
Lube dents in strait-walled rifle cases (45-70, 444 Marlin, etc.), are common and somewhat difficult to avoid with oil (wet), lubes. Over application of lube on bottle-neck cases are possible via over-lubing them also. In that situation they are harmless and disappear on firing.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)