How to Measure H20 Water Capacity

[M. Padilla]

How is case (water) capacity measured?

 

[NorCalMikie]

Re: Water Capacity

I just had the same question. To the top or to shoulder neck junction? Ozs or grains?

 

[kelbro]

Re: Water Capacity

To the top is most consistent. Grains is good. A little alcohol mixed in the water helps reduce the surface tension and provides more consistent measurements.

 

[NorCalMikie]

Re: Water Capacity

Alcohol mixed in the water? I wondered about that. Good answer. I was thinking about maybe a little oil? Thanks.

 

[savagedasher]

Re: Water Capacity

It's case capacity.overflow grains of H 2 o. A Take fired case that is correct length not sized or UN primbed B Put it on the scale now zero the scale C Fill case with H 2 o full if you have spilled some wipe excess off the out side the case will have a bubble of H2o wipe it off D Now weigh again that's the grain of H2o over flow capacity. That's what Quickload uses as a standard .When you seat a bullet depending it shape and length it's deducts how much is taken away from total when seating a bullet. then you end up with how much useable capacity is left. Good Shooting
Larry

 

[M. Padilla]

Fellas thanks for your input.
Savagdasher, do you weigh several cases and get an average or do you weigh them all and then separate them by weight?

 

[savagedasher]

Depend on what I'm using them for. Hunting i do it to make sure what I'm loading it correctly some cases you can have as many as 3 gr difference . If it Remington or other brands i know they were from the same box a couple is all that is needed . Competition any re loaders does anything they can to make his loads the best he can. Any reloading I always clean and inspect the brass, size, uniform prime pockets ,cut to length, champfer necks and weight each powder charge to. 01 tent of a grain. Larry

 

[M. Padilla]

Thank all of you for your help.

 

[Leaddog]

Water has air in it. Use 99% Isopropyl Alcohol for more accurate results.

 

[mac86951]

Water has air in it. Use 99% Isopropyl Alcohol for more accurate results.

Careful, Case capacity as measured by water is based on the fact that water's specific gravity is 1 gram/ml.
IPA is only 0.786 - 0.788 grams/ml (20/20 C). Since you are measuring volume by weight, IPA won't work.

If you want to reduce surface tension, use a drop of soap, or case lube on edge of case.

-Mac