sorting brass ,,weight tolerance ??

[Eric Leonard]

say with PPC or BR size brass how light or heavy would it have to be before you set it out and not use it in a match??

+/- .5 grs +/- .7 grs whats your limit if you weight sort your PPC brass??

 

[tclaunch]

I hope some respond to this with measuring by internal volume vs case weight. I have never tried it but want to, just need another lesson. Some use a ball powder.

 

[/VH]

As you wish, tclaunch:

http://forum.accurateshooter.com/threads/case-weight-uniformity.3898713/#post-36745189

I just hope someone staight up answers the OP's question.

 

[Dusty Stevens]

I sort my ppc cases by finding a bunch the same weight then going .1gr higher and .1gr lower if i dont buy 100 already sorted from ron hoehn which is the best way to get ppc cases by the way

 

[Mozella]

Here's my take. I hate to buy stuff and not use it, so I don't set my good competition brass on the shelf just because it is a little heavy or light, but I do weight sort it.

For F/TR I need 60 good rounds, but they're shot 20 to a string so it's most important to have three batches of 20 identical rounds. It would be nice to have them all identical, but I don't insist on that. Typically I sort about 70 cases into light, medium, and heavy while separating out very light or very heavy ones (if necessary) to use as fouling rounds and/or sighters.

In the real world using Lapua .223 brass, I usually start with 70 cases within half a grain and sort them into three groups. My trimmed and pointed bullets get sorted the same way, but to .05 gr. tolerance.

If I don't have 20 rounds in one group (let's say medium has only 18 rounds) then I find the lightest heavy case and the heaviest light case and move them into the medium group. I do the same for my bullets too, by the way.

Then I load three batches for the three 20-round targets and use the remainder for sighters, separating out an odd-ball or two for fouling rounds.

So, assuming weight sorting helps (I happen to think that it does, but I'm not offering any proof), this method seems to be a reasonable approach to weight sorting without having to reject expensive reloading components or those which have undergone a lot of time consuming hand work.

 

[dedogs]

use as fouling rounds and/or sighters.

Please forgive my ignorance, but what good is using a cartridge that is out of spec. for a SIGHTER? dedogs

 

[expiper]

Hi big un,,,,I was weigh sorting brass a while bak and found 6 out of 100 that were "heavy" (~2 gr) and set them aside and marked the bases to keep them separate,,,when reloading them I foound that the rim was not cut deep enuff to allow the cases to go in the shell holder without a lot of effort and fiddling,,so there was xtra brass and weight in the case head area that had nothign to do with case volume,,,,aafter loading I shot a few shots with the 94 good un's and then tried one of the "6",,,it shot right thru the same hole,,,,since then I see more evidence to confirm these findings....Roger

 

[4xforfun]

About the 2nd year I compeated in 1000 BR I bought 500 300 WBY (actually 340 wby) brass for the guns I shot at the time. I fully prepped them and turned the necks. I then weighed the whole batch. I simply sat at a big table and started seperating into 1/10 grain lots. Of course you would only have one or two pieces at each weight at either end (high or low). I simply grabbed one of those electric buzzers (that, my friends, is an industry term ) and numbered each case from 1 - 500 and seperated into lots of 50. I would then shoot them in order. Of course, in the middle lots you might have 35 or more cases all weigh exactly the same. I still ran em in order. I shot em all. like was said earlier....the very few at the bottom and the top are cirtianly good enough for foulers and early sighters.

I did the same with 200 25 WSSM brass that I necked up to 6.5. Now, these Winchester brass were TERRABLE as far as consistancy, There were pieces of brass that were WAY out of speck. So, I took the low 25 and the top 25 and made a batch of sighter/fowler brass with them and the other 150 were my "comp" brass.

Just my .02
Tod

 

[ZenArchery]

It really depends on the rifle and your intentions.
Precision shooting I keep within a .002 range.
For hunting/plinking ranges .010 range.
I notice my .223 is more of stickler when it comes to bullet/load development tolerance.
The .308 is very forgiving.

 

[dmoran]

By volume, I like small cases to hold under 2-tenths max variation.
For medium size cases 3-tenths, and large cases 4-tenths.
For the big magnum cases +1/2-grain.
Donovan

 

[Mozella]

Please forgive my ignorance, but what good is using a cartridge that is out of spec. for a SIGHTER? dedogs

They're not THAT out of spec. After all, if you don't weight sort brass, as at least half of my competitors don't, then you might argue that ALL the rounds are out of spec.

We're talking about a tiny difference in case weight, which plenty of people argue either makes no difference or isn't actually related to case volume. Don't worry, my sighters, even if they have a case weight half a grain different from the "good stuff", impact plenty close to the target 3-9 o'clock waterline. F/TR is all about the wind.

 

[Dusty Stevens]

I sort to the .1 just to find that occasional light or heavy one and that does make a difference on a ppc. I can pick out a heavy case every time as most br shooters can. Sorting to .01 doesnt matter