Shot Shell Base (non-brass)?

[tonelar]

I know that on my AAA and other shells, that the bases are brass, but I recently bought a bunch of economy stuff that isn't brass colored...

What are the silver bases made of on these shotshells? I'm guessing aluminum? Or are they tin?

[Newshooter]

Mild steel.

[tonelar]

Ok, that makes sense. One of my shotguns is 100% with brass, but doesn't do so well with these cheaper shells. Maybe the mild steel doesn't bounce back from expanding like the brass does...

Thanks

Updated to add: Emailed the seller/importer and they recommend only Winchester brass based ammo.

[aippi]

Bingo tonlar, you nailed it......... and this can cause extraction problems in many weapons.