Does different brass really change Ballistics?

[lower lover]

[mif_slim]

sometimes it varies. I've found sometimes diffrent head stamps shoots same groups and sometimes it can vary from 1-2 MOA groups.

[juelz919]

for shotguns i think it is important. because the cases are pretty different.
metallic cases i dont think it makes that big of a difference

[TKM]

Everything can make a difference. Including barometric pressure and temperature.

Sometimes it is very difficult to tell the difference.

[SVRider]

It can. Depends on what it is you are trying to load for. If you are making plinking type ammo, don't load to maximums and you'll be fine.

If you are precision rifle shooter, they won't even mix different lots of brass from the same manufacturer.

Like I said, it just depends on your intended use/expectations....

[Twystd1]

Yes.