Various Cases Change Point of Impact?

[roysclockgun]

I try to load 200 rounds of any one caliber at a time. I do separate the brass by brand name and mark the boxes accordingly. However, after zero at 300 yards, a brand change does not appear to move the point of impact.
Anyone else notice this, or a different result?
For hunting, I would not use different brass after zero is attained. Still I wonder what real difference, if any it would make.
Steve Ashe

 

[IdahoCTD]

Close range doesn't always change much but the longer ranges can show drastic differences. Different brands have different case volume and therefore create different pressures. That leads to different velocities and large velocity spreads show up big at long range.

 

[Elkman]

It depends on the rifle. My 300 hits 1 inch farther to the right with Remington Cases. In the past I have always reset the scope each fall. However as my long range testing has all been with WW, I now use them exclusively, I "never" mix cases in any boxes or when I am loading, and pretty much stay with the same brand. For normal hunting distances it probably makes little difference, for long range hunting or targets it could.

 

[Kodiak]

Yup,

Always stay with the same brand/lot of brass when reloading.

Consistency is the name of the game.

 

[JD338]

I bought some nickel plated Rem brass for my 45-70 and had to make a 2" scope adjustment at 100 yds.

JD338

 

[Oldtrader3]

I have noticed bullet impact shifts of up to 3 inches at 100 yards when changing case manufacturers. This is expecially true with larger bores it seems and some magnums. I try to stay with the same manufacturer each time that I buy new cases. Or sometimes I will have two brands because of limited availability but I keep them separated by manufacturer.

I even sample and weigh several cases when I order new cases by the same manufacturer, in order to assure myself that nothing has changed.