weighing cases ?

[cocopuff]

I have done alot of reading on this subject...I guess
I understand why it is done..Some say it makes a big
difference in accuracy and some say it is a waste of time.

So if you get a new batch of brass and weigh them and sort
them out. What do you do after fireing them? And after you
trim them? Are they weighted again?

I realize it is the inside volumn that your after,correct?
But what about the neck tention? Isn't this going to change
with each trim? The necks much be getting thinner..There
for changing the weight of the case..Wouldn't this change
the case volumn?

 

[hogpatrol]

I tried weighing an segregating my .223 brass. Did Lapua, Remington, IMI, and Lake City. On the target, couldn't seen any difference than using them random within brands.

 

[dkhunt14]

I believe at short distance or with certain cases or guns you will probably not see it. I do know with some at 1000 it made a difference and also showed on the chronograph. It was enough to make it the difference between winning and losing in 1000 yard Benchrest. Matt

 

[tenring]

I gave up wasting time weighing Lapua brass, because it is always so close. WW, REM and others are not that uniform. Annealing, and trimming after the first and second firings, however, must be done for consistency.

 

[fguffey]

weighing cases ?

Why weight cases?

F. Guffey

 

[Catfish]

If you are shooting bench rest and looking to shrink your group by another few .001`s go for it, if your shooting a factory gun you`ll never be able to tell any difference.

 

[Terry]

For long range shooting consistency is the goal. Once your brass in in finished condition, you could check case volume. Donovan Moran's method of checking capacity with ball powder is the most telling method I have used. Two cases out of 200, the heavyest and the lightest held the same weight of ball powder. You may have different findings. I have weight sorted brass. I can't prove it helped, but it did not hurt.

Only by testing will you know.

 

[MagnumManiac]

This is where the problem lies with ONLY weighing cases. Brass, of all makes, is made by many different drawing/extruding dies in differing conditions of wear. Some squeeze brass thinner than others and when it is trimmed at the factory, some cases will have less brass than others, but the internal volume may STILL be the same, as is the case that some cases will weigh the same, but have totally different volumes.
With new brass, I take 10 samples and measure case volume in CC's of isopropyl alcohol, not water in grains, it is NOT accurate for my purposes. YMMV.
I have weighed in the past, but still found cases of the same weight to vary in volume and produce flyers.
I no longer rely on ANYTHING other than the actual volume on once fired, trimmed and cleaned cases, before and after sizing.

Cheers.

 

[Webster]

Can you sort cases based on Chrono speed?

 

[ronemus]

I did an experiment several years ago to determine just how much effect brass weight has on .223 loads. I used WW brass (sized, trimmed and deburred, primer pockets uniformed, flash holes deburred, and neck turned) , WSR primers, charges of RL-15 or N-550 powder weighed to 0.1 gr, and 75 gr A-Max bullets. Using the lightest and heaviest cases (sorted from 1000 once-fired I had on hand), I had two lots of 10 cases with a 3 gr difference in weight. The average muzzle velocity difference was 16 fps, just a bit more than the 12 fps due to 0.1 gr of powder. I choose to sort 0.5 gr lots of .223 brass for my long range loads, but the effect will only matter at 800-1000 yards - the vertical displacement on the target from such a small velocity change is negligible at shorter distances. Unless you control all other sources of variation, the effect of brass weight is negligible. I also shoot .284, and because the brass is twice as heavy I batch in 1 gr lots.

 

[BartsBullets]

Can you sort cases based on Chrono speed?

TA DA!!!! As long as you use meticulously loaded ammo using a chronograph is the best way! In my humble opinion!