Author Topic: case capacity 56-50?  (Read 167 times)

Offline sixtus

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case capacity 56-50?
« on: May 13, 2019, 06:51:38 am »
Just wondered if someone has measurement for the total water capacity to the case mouth for the 56-50? Has proved to be elusive to find online

Online El Supremo

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Re: case capacity 56-50?
« Reply #1 on: May 13, 2019, 07:33:20 am »
Hello, Sixtus:

Never bothered to measure because that sort of thing is not much use for pistol length black powder shooters.
Case capacities vary because of internal taper differences and the seating depth of different weight bullets.
I have found at least EIGHT different 56-50 cases have been used over the past 20 years. 
Now, it's down to STARLINE, RMC and cut-down 50-70's from STARLINE.
AND there are internal variations within these brands.

Practically speaking, with BLACK, and the OAL ctg factor, most can load around 35gr by weight of 3F with a 310-350 grain bullet and a SLIGHT bit of compression for the heavier bullets.

This produces around 900 -1000 fps muzzle velocity from a carbine.

Hunters here have reported effective deer shots at 75 or a,bit furthrr with well placed bullets. 

All the best,
El Supremo/Kevin Tinny

Pay attention to that soft voice in your head.

Offline sixtus

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Re: case capacity 56-50?
« Reply #2 on: May 13, 2019, 08:19:08 am »
Yep I know brass theory.

Still after a general ballpark for the cartridge. If anyone knows or could measure theirs in water would be great. Starline if its the most common. I am just trying to get an idea alongside the modern 50 cal cases( AE, SW, linebaugh etc) for general interest.

Online Blair

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Re: case capacity 56-50?
« Reply #3 on: May 13, 2019, 12:41:07 pm »
The 35 gr. by weight of BP, with a 310-350gr. bullet is probably the best you will get for a modern 56-50 Spencer cartridge case for a "ballpark" estimate.
 The 56-50 is the longest and largest of all the 56 size series of cases.
You need to know the overall bullet length to case length that will feed through the action of your firearm correctly. Powder capacity comes once you have set up dummy round "s" that cycle properly. This info will give you an idea of how much powder room you have in a workable cartridge (PB only! You are on your own with smokeless)
My best,
 Blair
A Time for Prayer.
"In times of war and not before,
God and the soldier we adore.
But in times of peace and all things right,
God is forgotten and the soldier slighted"
by Rudyard Kipling.
Blair Taylor
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Offline Oregon Bill

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Re: case capacity 56-50?
« Reply #4 on: May 13, 2019, 03:39:34 pm »
I weighed a fired Starline case with spent primer and got 180.5 grains, and 228.8 filled with water, so 48.3 grains or so.

Offline Herbert

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Re: case capacity 56-50?
« Reply #5 on: May 13, 2019, 04:22:28 pm »
If you want the most powder in a case the cut down 32 ga brass shot shell is way to go I can compress 45gr of Wanno FF in this case and seat a 395gr bullet on top no trouble with this case with the Starline case 40grs with the same bullet is the most I can get booth are very good loads capable of taking big pigs past 100 yds with ease
« Last Edit: May 13, 2019, 06:46:39 pm by Herbert »

Offline sixtus

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Re: case capacity 56-50?
« Reply #6 on: May 13, 2019, 08:51:47 pm »
I weighed a fired Starline case with spent primer and got 180.5 grains, and 228.8 filled with water, so 48.3 grains or so.

Oregon Bill much appreciated, thats all I was after. So its in the ballpark, a little smaller than most of the modern 50 cases. I spent a lot of time with big bore wildcats and so forth, some people like me just want to know these things.   :)

Thanks all for the general information, very helpful!

Offline sixtus

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Re: case capacity 56-50?
« Reply #7 on: May 13, 2019, 08:53:20 pm »
If you want the most powder in a case the cut down 32 ga brass shot shell is way to go I can compress 45gr of Wanno FF in this case and seat a 395gr bullet on top no trouble with this case with the Starline case 40grs with the same bullet is the most I can get booth are very good loads capable of taking big pigs past 100 yds with ease

Thanks Herbert that is what I would like to do myself, a load for pigs up here.

Offline Oregon Bill

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Re: case capacity 56-50?
« Reply #8 on: May 14, 2019, 08:12:04 am »
Happy to answer your question, Six.
Herbert, thanks for the 32 gauge shotshell tip. I was wondering how I might build suitable hunting loads. The Starline brass capacity seems to limit most BP loads to under 1,000 fps.