I'm on a bit of a Question roll this afternoon!!

I have a collection of some spent 308 brass that I have saved. I have some Sako brass, some Federal Brass and some Lapula brass.

Is it possible to reload these once fired cases and use them interchangably, or does all the brass have to be of the same origin??

Rgds,
FB

You can use them interchangeably but: 1) internal case volumes won't be the same so charge weights should be worked up with the case that has the least volume to avoid overpressure, 2) you will probably have to crimp in batches with the same brass as case wall thickness at the neck will probably differ and you won't get the same crimp. Don't expect great groups from three shots with three different cases, although you might get lucky.

FB.

Wink's about right, there's a lot of work involved.

You could weigh each lot# in turn to find an avarage weight and discard each end of the specrtum, to stay within +/- 1/2 grain per lot#.
Then you have the issue of case wall thickness at the neck in each lot# which again may alter neck tension.
Are all the flash holes the same size...this may alter burn exposure for your given primer.

lt may also transpire that each lot# just won't shoot to the same point of aim, l tried it with Norma and Federal brass and it just wouldn't go anywhere near...l had two nice groups but not in the same plain so l scrapped it as a bad idea.

You may find that you can get each lot# of brass to shoot a differant bullet weight to the same point with a little tinkering, now that would be handy as l know someone who does that and then has a handy battery in his pouch when things need a quick change.

Anyway mate good luck and let us know how you get on.

ATB.

Dave.
....

FB,

As said above, you'll rarely get great groups from mixed brass.

However, mixed brass is fine for practice rounds when doing some casual offhand shooting etc, as an inch this way or that doesn't matter much in such cases. "Minute of grapefruit" at 100 meters is good enough in such instances IMO, and that will usually be due to the shooter, and not mixed brass!