WE got go 510 once fired 338 Lapua brass made by Lapua.

And as we usually do, we prepare it bu sizing, trimming, and cleaning the primer hole.

We then weigh it all and segregate them by weight.

Here is what we got.

326 grains 1
327 10
328 25
329 77
330 271
331 100
332 25
333 1

What's your question?

Larry

No question Larry.

Just posted this for information.

Not bad, all but one were within 1% of the largest group at 330 grains.

For those of you not familiar with manufacturing tolerances, that is incredible consistency. Over 50% were at a single weight, the 113 cases under that weight and 126 over give a very even distribution within a +/- 1% envelope.

I think new manufacturing methods help too.

I have several rifles in 300 Winchester Magnum, and we fired quite a few boxes of S&B 180 grain factory ammo.

We keep each rifle's cases seperately to be used only in that rifle.

I weighed some of them and was very pleasantly surprised how close they are.

This is why Lapua is the only brass I use for my .338 Lapua Magnum, and when I can aford it in any cartridge they make that I load for. Just good stuff.

That seems a very tight tolerance, especially in such a large case.


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Thanks for sharing your data. If you load up 5 rounds using the lightest and 5 using the heaviest, what do you see? Are the groups or velocities any different?