Sorting cases by weight

[Crosshair]

I have been following this forum for quite some time and have learned a great deal. I have a question about weighing cases verses accuracy. I know that different case volumes will have a direct effect on the combustion if you will of the powder charge. Just how close do you sort by weight? Would sorting within 1 grain be good enough or would it have to be taken down to .1 grain? My weighed cases weigh between 187.5 to 189.0 with most being around 188 grains.I use a NECO gauge and sort by concentric then weight and by the time I'm done there's not a lot left that are exactly alike after culling. How much difference in accuracy are we talking at 100 yards? By the way the shelf life of unopened unrerigerated catsup is 1 year. Opened unrefrigerated 1 month and opened but refrigerated is 6 months.

Thanks: Crosshair

 

[Pete in Surry]

This subject comes up frequently

I have been following this forum for quite some time and have learned a great deal. I have a question about weighing cases verses accuracy. I know that different case volumes will have a direct effect on the combustion if you will of the powder charge. Just how close do you sort by weight? Would sorting within 1 grain be good enough or would it have to be taken down to .1 grain? My weighed cases weigh between 187.5 to 189.0 with most being around 188 grains.I use a NECO gauge and sort by concentric then weight and by the time I'm done there's not a lot left that are exactly alike after culling. How much difference in accuracy are we talking at 100 yards? By the way the shelf life of unopened unrerigerated catsup is 1 year. Opened unrefrigerated 1 month and opened but refrigerated is 6 months.

Thanks: Crosshair

If you check the archives you will find threads about it. I think the general concensus is that weighing does not tell one anything about the volume. the heads vary in weight so it is not possible to find exact anything.

 

[Dave Coots]

Crust

Crosshair,all you Jersey guys have a pretty good sense of of humor!That's good! I have a basic (cheap)approach to sorting brass.Acquire one box of Lapua 220 russian,weigh and place on two sheets of notebook paper(also cheap)with a pencil(free ,if you don't mind spending eternity in hell for stealing)Write the weight on the paper in front of the case(187.8 or whatever) keep going ,when you're done you'll have a stretched out bell shaped curve.,take 25 cases from the left, put em in a baggie(mark the weight range on the baggie) 25 from the right same thing.split the last 50 down the middle,two more baggies. I turn and form my cases 25 at a time(that way I don't get burned out).I also shoot my cases in one barrel 25 at a time,that way if anything is "funny" about a case it will be easy to recognize and mark the case rim with a sharpie marker(also cheap).Does weighing make a difference? probably not,but I think keeping track of any "funny"(nicked on the case mouth,dropped on the concrete on the neck,bullet seated easier or harder than the others or primer seated easier or harder than the others)cases is important. But then, I ingested some 10yr old Ketchup and may have brain damage as a result!
Oh yeah, new guy mystery question! How long do those frozen pizza crusts last ? I ate one last night that had to be 4 yrs old and was kinda stiff .
Joel

Nader

You say that crust was kinda stiff--did ya thaw it out?

Dave

PS Don't bring it to Iowa to thaw out-global warming is a thing of the past.

 

[Apollo]

spreadsheet

Not sure if I uploaded this correctly, but here is a spreadsheet I came up with a year or so ago. Sample as many cases as you wish - enter the grains - at the bottom it will calculate the STD and min/max values. You can change the % and it will change the min/max values. The lower the % the more "picky" it gets. Does the spreadsheet work = yes. Does sorting cases by weight work = probably not.

Stanley