3006 brass ?

I'm not looking to be a bench rest shooter
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Forgive, and thank you, there is nothing I said that would suggest I am a bench rester. There are differences in cases, I built a rifle and loaded 6 boxes of ammo for it using 12 different loads of 10 rounds each with 12 different head stamps. The groups moved but never opened up. I duplicated the 12 different loads and ask the new owner to find out what the rifle liked. He shot all 120 rounds and informed me the rifle liked all of them. Then went to complaining about cleaning the rifle, he said he had never seen a rifle that difficult to take apart.

I responded with "YOU TOOK THE RIFLE APART!!? "After 120 rounds?" "Did you get it back together?"

F. Guffey
 
Google the SAAMI site (http://www.saami.org/specifications_...tion/index.cfm) and go to the 30-06 Springfield section and see if there is a spec. on case wall thickness...
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Saami says: Then the next post will claim SAAMI is not a mandatory agency and they will add the volunteer group. We had one member call SAAMI wanting them to agree with him, I was not there but I can only imagine how leading the questions were.

The case does not have head space, the case has a length that is measured from the datum to the case head. But? There are a few that can not deal with that.

F. Guffey
 
I get my brass from where ever it is all mixed brass. For .308 and 30-06 I seperate by headstamp and weigh them. I work up my rifle loads using the heaviest cases as a starting point for the powder charge. There is enough variance in case weights that if you are using a medium load in a thin case it can be a max load or even an overcharge in a heavy walled case. You could easily have a stuck case or a case head seperation if you do not do the same.
 
06shooter, would you like me to send you a private message about your concerns?
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While deciding on Bart B.s request I will give you something to think about. I loaded 150 30/06 rounds on a Dillon 550B, when finished there was 17 grains difference between the lightest and heaves round. The powder charge was correct, the bullets weighed the same. The 17 grain difference was the difference in case weight, straight across the board the Winchester cases were lighter.

F. Guffey
 
F.Guffey I stand here thinkin to myself,, you just touched on the reason I have so many flyers......hhhmmmm. Yep I could fly to France twice and I think you've showed me why.

If 150 cartridges have 17 grain difference in weight from top to bottom, then there a huge possibility that when I prove my data I should weigh and get the ten similar weights to prove my loads, damn and I thought it was all on me...damn...
 
I've shot the same load in .308 Win cases whose weights ranged from 150 grains to 175 grains, all in the same rifle barrel. Powder charge weights and primers were all the same a couple grains below maximum; only Sierra 168's were used. There was no significant difference in accuracy through 300 yards with them. Several 10-shot groups were used with each case weight (average in a 3 grain spread) in their comparisons; some at 200 yards and others at 300 yards. There was about a 1 MOA spread in elevation zeros across them a 300 yards; not as much at 200..

There's no reason in my mind that .30-06 cases should not perform the same across a 25 grain spread in weight.

Regarding fliers; how does one tell what caused that shot hole far from the rest of them to be there? It happens because of either the ammo being bad or the person shooting bad.
 
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There's no reason in my mind that .30-06 cases should not perform the same across a 25 grain spread in weight.
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Bart B. I reserve the luxury of not agreeing with or believing you.

There was an article, before the Internet, written by a shooter, reloader, writer in one of the fine gun type magazines. He purchased 500 cases from one manufacturer as in from one lot. He inspected, sorted loaded those cases over and over until he settled on 47 cases out of the 500. The 47 cases could be loaded and shot, the rest? required instructions.

He did find cases he sorted and found to be different were accurate if he indexed the case in the chamber. He found the powder column in those cases were not centered.

F. Guffey
 
None of the cases I've used have perfectly centered powder columns across all of them for two reasons.

None of the cases have perfectly centered powder chamber dimensions uniformly distant from their outside surfaces; case walls vary in thickness around them a few thousandths of an inch. That puts the powder chamber offset a bit from the outside shape of the case. The powder chamber's center is offset from the outside dimensional axis 1/2 the spread in case wall thickness.

None of the powder charges 100% fill the space inside the cases. Load density is close to, but never at 100% There's a small air gap at the top of the powder chamber so the center of the powder mass is a little below the center of the powder chamber inside the case. But it's pretty repeatable from shot to shot in its location. That's why the "SAAMI twist" was used to properly chamber test ammo in SAAMI spec'd pressure and velocity test barrels so each powder charge would be positioned exactly the same in each round.

Such is life with all cases and less than 100% load densities and uneven case wall thickness.
 
If I remember correctly, the OP asked if there was a SAAMI spec on case wall thickness. His next post confirms there aint. SAAMI specs. aren't like a speed limit; they are industry standard "suggestions" (which 99% of manufacturers abide by).

Posters who oh so quickly, post disagreeable retorts get real tiresome quite quickly...
 
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Regarding fliers; how does one tell what caused that shot hole far from the rest of them to be there? It happens because of either the ammo being bad or the person shooting bad.
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Posters who oh so quickly, post disagreeable retorts get real tiresome quite quickly...
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The writer, shooter reloader grouped cases that would be considered flyers as in causing bullets that strayed from the group. He indexed the cases, after loading again he found the cases were as accurate as his select 47, problem? the group seemed to have a mind of their own and had there own little group.

And then he rotated the cases with different indexes, the whole bunch went back to what could be described as 'all flyers'.

Again, this was before the Internet.

F. Guffey
 
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