Bullets and brass are always going to have weight variations. That's just the nature of the beast, especially when they come off different machines and from different lots of material.
The seriously deformed cases, though? I've never seen that in any of the new brass that I've bought, and I'd definitely be calling the manufacturer to task about it.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.