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Can anyone please explain to me what the differences are in the makes of brass cartridge and how must influence they have on the ultimate accuracy of a shot.
A lot of people i have spoken to say that Lapua brass is the best to use when reloading, there is obviously a reason for this but what is it.
Andrew

Consistency of internal volume/ case thickness and annealing.

Chapuis wrote:Consistency of internal volume/ case thickness and annealing.

Yep, consistency is important for the precision reloader, but it also shows in the performance of factory ammo, particularly after long periods of storage.

I have used Prvi brass and Lapua for my 308. Prvi was once fired from my rifle and so only neck-sized, the Lapua was once fired in a mate's rifle and so FL sized. With 155 gn SMKs and N140 the Lapua were more accurate AND more consistent. Same with 303, the HXP brass I use makes for more accurate rounds. Also seems to be slightly heavier than Prvi brass

If it increases confidence in your loads/set up that can lead to improved results down range. In my 7mm RPA I only have two types of brass, PPU and Remington. With exactly the same load, I see no difference at all.

Years ago someone told me that all cartridge brass, except Lapua, Norma and Hornady are all made by one company, Starline. Don't know the validity of that, but during the doling out of the thirty pieces of silver for my handguns, the compensation for surrendered brass went from 5 to 10 pounds per 100 because of this, allegedly.

My experience when comparing brass is only in .308 and is only between Federal and Lapua. I found the Federal brass fire formed to such a point, that accuracy dramatically improved on subsequent reloads. Whilst just neck sizing, the group size nearly halved. The Lapua brass didn't seem to change the group size whether it was fire formed or not, however the Federal brass produced significantly better groups. I'm not sure why that's the case, but based on my tests I prefer Federal over Lapua in my M14 in .308.

I do like Federal however it never seems to last as long as Lapua. Norma can be quite good as well.

Lapua lasts.

I'll get 9+ reloads from Lapua brass, ppu started getting split necks on the third loading.

Lapua is also a lot more consistent.

With the exception of my 6.5 Grendel, 270 WSM and .308 I use PPU brass exclusively i my rifles and don't have any problems. Some of the PPU brass is on it's 10th reload and still looking fine. My .308 brass is all Federal but that's only because I get it for free. How hot are you lads loading your PPU brass?

102gr of us869. Below max by 3gr.