brass

[chipper]

Old brass, new brass, does it make a difference in groups, FPS, or anything else.

 

[JD338]

Yes it can.
It depends on the rifle caliber, chamber dimensions, quality of brass, how many loadings, how hard the case has been worked with the load level and the sizer die.
Cases stretch and thin out over time, some more than others. Can affect case volume and neck tension.

JD338

 

[rick smith]

It can with different lots and different manufacturers.Rick.

 

[nodak7mm]

Yep, yes and heck yeah... Do yourself a favor, buy a new bag of brass, buy one ammo box for it and never mix it or add to it. If you need more than 50 or 100 in one setting, buy appropriatly, but never mix it from one box to another and cycle it through progressivly. Thats one varible you can control easily.

Rod

 

[romex2121]

oops,,, ive got a bad habbit of throwing all my brass in the same bin :roll: guess i wont do that again :wink:

 

[Ridge_Runner]

and shoot it all before reloading it again, that keeps the same amount of fireings on it so its more uniform.
RR

 

[Elkman]

Don't mix, each brand shoots a little different just like powder and bullets.

 

[FOTIS]

Yes can make a big difference. Weigh them and ensure they are deprimed resized and weigh within 2% of each other.