Case Capacity Difference By Brand

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Spokerider

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I am going to reload some .270 Win ammo. I have some Winchester stamped cases and some Federal stamped cases, about an equal amount of each.

Will these cases have a difference in capacity by brand? If so, by how much? Is there a chart or table available that shows the different case / brand capacities, so that one could compare?

When reloading .308 ammo, I noticed an approximate 1gr difference between Win stamped cases and Federal stamped cases. The Federal case had less case capacity, and that made a significant difference to the POI at the range.

Thoughts?
 
You answered your own question. There can be a difference in capacity between brands. There is even a good chance there will be a difference in capacity between different lot numbers within the same brand. There is even variance within cases of the same lot# and manufacturer. The only way to know how much variance there is would be to measure it yourself. Winchester brass usually has more capacity than most of the domestic brands because the brass is slightly thinner.
 
Spokerider said:
I am going to reload some .270 Win ammo. I have some Winchester stamped cases and some Federal stamped cases, about an equal amount of each.

Will these cases have a difference in capacity by brand? If so, by how much? Is there a chart or table available that shows the different case / brand capacities, so that one could compare?

When reloading .308 ammo, I noticed an approximate 1gr difference between Win stamped cases and Federal stamped cases. The Federal case had less case capacity, and that made a significant difference to the POI at the range.

Thoughts?
Click to expand...

You are best to sort your cases by brand, and keep them separate. Determine if there is a difference by shooting them. Or you could fill each case type with powder and weigh them.
 
Ron AKA said:
You are best to sort your cases by brand, and keep them separate. Determine if there is a difference by shooting them. Or you could fill each case type with powder and weigh them.
Click to expand...

Say what?

Weigh the empty case. The heavier the case, the less the capacity. With a digital scale one can sort a lot of brass quickly. All you need is some containers labeled with weight ranges. e.g. 177.0 - 177.5
 
Ron AKA, Not sure your experience level, but I would take what Ganderite said to the bank. There is a metric assload of knowledge in that cranium of his....he has forgotten more than I have ever learned.

Boltgun
 
Boltgun said:
Ron AKA, Not sure your experience level, but I would take what Ganderite said to the bank. There is a metric assload of knowledge in that cranium of his....he has forgotten more than I have ever learned.
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I have been reloading for over 50 years. If you want to know the weight of the brass, then weigh the brass. If you want to know the volume of the case then fill the case with powder, and weigh the powder. When you fill one case with powder then dump it into the next case after you have weighed it. Speeds the process up. Some do it with water, but I find that very messy.

Remember it is the volume of the case that affects ballistics, not the weight of the case.
 
Ron AKA said:
I have been reloading for over 50 years. If you want to know the weight of the brass, then weigh the brass. If you want to know the volume of the case then fill the case with powder, and weigh the powder. When you fill one case with powder then dump it into the next case after you have weighed it. Speeds the process up. Some do it with water, but I find that very messy.

Remember it is the volume of the case that affects ballistics, not the weight of the case.
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good, so you are not an in-experienced shooter/loader. I will leave it up to people have different methods. Glad you didn't take my comment out of context and get offended as it as never meant that way. You can also test Ganderite's methodology as its sound also.

Boltgun
 
Ron AKA said:
You are best to sort your cases by brand, and keep them separate. Determine if there is a difference by shooting them. Or you could fill each case type with powder and weigh them.
Click to expand...

But Ron AKA at Accurateshooter.com you said to fill the cases with heavy water from a Canadian nuclear power plant. (now that is an original idea you didn't copy from someone else)
 
jethunter said:
I'd like to see that. Got a link for it?
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He has many posts like that, Ron AKA just wants to get his post count up and try to impress the big boys who actually know what they are doing.

I use tap water with a drop of dish soap and check that against all the other cases for H2O capacity.

Besides, I live close to Three Mile Island and worked less than a mile away when it melted down. And would never make a stupid comment about heavy water like Ron AKA did.

tmi-plant.png
 
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Prep your cases before weighing them, then sort as Ganderite said.
POI might change a little bit at shorter ranges and they will definitely change at longer ranges.
 
Ron AKA said:
I have been reloading for over 50 years. If you want to know the weight of the brass, then weigh the brass. If you want to know the volume of the case then fill the case with powder, and weigh the powder. When you fill one case with powder then dump it into the next case after you have weighed it. Speeds the process up. Some do it with water, but I find that very messy.

Remember it is the volume of the case that affects ballistics, not the weight of the case.
Click to expand...

Assuming the cases have the same exterior dimensions (fired in the same rifle, or, second best, sized) then the heavier case will have less volume. The OP has a quantity of two brands.

I suggested he segregate by brand and then sort the cases by weight. The weight differences will give him an idea of how different the volumes are. i.e. large or small.

If he needs to know the actual volume of the brand, he would take the middle weight sample of each brand and fill with water. H20 volumes are often used to compare capacity. When I do it I use a syringe.

If you are suggesting using powder to measure the capacity of 100 or so cases, I find that ridiculous.
 
bigedp51 said:
He has many posts like that, Ron AKA just wants to get his post count up and try to impress the big boys who actually know what they are doing.
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Did he say what you said he did?
But Ron AKA at Accurateshooter.com you said to fill the cases with heavy water from a Canadian nuclear power plant. (now that is an original idea you didn't copy from someone else)
Click to expand...

Do you have a link to that?
 
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Ganderite said:
Assuming the cases have the same exterior dimensions (fired in the same rifle, or, second best, sized) then the heavier case will have less volume. The OP has a quantity of two brands.

I suggested he segregate by brand and then sort the cases by weight. The weight differences will give him an idea of how different the volumes are. i.e. large or small.

If he needs to know the actual volume of the brand, he would take the middle weight sample of each brand and fill with water. H20 volumes are often used to compare capacity. When I do it I use a syringe.

If you are suggesting using powder to measure the capacity of 100 or so cases, I find that ridiculous.
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Ganderite

Don't tell him anything or even reply, your just educating him and he will replete it in another forum.

The image below is from http://www.accurateshooter.com/cartridge-guides/223rem/ The problem is many say there is no relation between case weight and case capacity. (see below) But I sort my cases by weight from the same batch and call it good enough.

223_case_capacity.png
 
Spokerider said:
When reloading .308 ammo, I noticed an approximate 1gr difference between Win stamped cases and Federal stamped cases. The Federal case had less case capacity, and that made a significant difference to the POI at the range.

Thoughts?
Click to expand...

How did you find that out?
 
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