44-40 Pressure Test Results Videos

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Bryan Austin
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44-40 Pressure Test Results Videos

Post by Bryan Austin »

Over the past few years I conducted 83 ten shot tests using the PressureTrace II system. Recently I decided to try and open up a comparison chart using overlays in the Gimp editing software and make some videos out of them..

It is not the best but I think it is certainly good enough for discussions.

It took me a while to satisfy myself as to the accuracy, but with the discovery of a few missing links, in general, everything is 100% consistent with reloading manuals and factory ammunition.

Rather than do one video at a time, once or so a week, I decided to dump a few all at one time. Check the website link below for updates.
https://sites.google.com/view/44winches ... authuser=0
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AJMD429
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Re: 44-40 Pressure Test Results Videos

Post by AJMD429 »

"...Replicated vintage black powder loads used pre-1884 unheadstamped cases that have the largest inside balloon pockets available. They created the highest pressures and fastest velocities, as advertised during that timeframe. I believe this to be due to the amount of powder that is down beside and "beneath" the initial ignition of the powder...possibly creating a "boost". The more shallow the pocket, the less "boost" created...."

Fascinating...!
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Re: 44-40 Pressure Test Results Videos

Post by buckeyeshooter »

Thank you for the information and all your work. You have given several new powders to try in 44-40 in a rifle. I have been using Unique exclusively in 44-40. I have a Uberti 66 for cowboy shooting with a 19 inch barrel, I use 7 grains unique and get 1040fps. My other 44-40s are Ruger Vaqueros (44 magnums with a second cylinder made up) and a Japanese 92. I have used up to 10 grains of Unique and chronographed the 4 3/4 Vaqueros at an average of 1012 fps with .430 diameter 200 gain jacketed bullets. I used this same load in the 92 to kill a nice doe one year, gave the same performance as I get from a Marlin 1894 in 44 Magnum. I look forward to experimenting with your information. Thanks again.
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Bryan Austin
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Re: 44-40 Pressure Test Results Videos

Post by Bryan Austin »

Ed Harris' 230gr 43-230G has been added to the new Reloder 7 230gr/240gr video...probably the best performing of the group.

I personally used a Hornady SWC HP for hunting but never tested it.

https://sites.google.com/view/44winches ... ace-videos
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Bryan Austin
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Re: 44-40 Pressure Test Results Videos

Post by Bryan Austin »

All eight videos have been added
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Carlsen Highway
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Re: 44-40 Pressure Test Results Videos

Post by Carlsen Highway »

Invaluable work Bryan, well done.
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Re: 44-40 Pressure Test Results Videos

Post by KWK »

I believe this to be due to the amount of powder that is down beside and "beneath" the initial ignition of the powder...possibly creating a "boost". The more shallow the pocket, the less "boost" created.
Now that wasn't expected. I'll hazard a guess the flame front was able to fan out into a greater volume. Instead of just a hemisphere as with solid head cases, it could advance to the sides of the pocket, getting more flame sooner in the critical initial phase of the burn.
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Bryan Austin
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Re: 44-40 Pressure Test Results Videos

Post by Bryan Austin »

Here is the case failure using the Western balloon pocket case and 40gr of Swiss black powder. The ignition path is obvious in this photo.
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Re: 44-40 Pressure Test Results Videos

Post by Rimfire McNutjob »

Is that a semi-balloon head?

I thought a full balloon head actually had a folded rim with powder space there as well. I'm a bit too young to have ever opened one up though.

Really enjoyed the videos.
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Bryan Austin
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Re: 44-40 Pressure Test Results Videos

Post by Bryan Austin »

Rimfire McNutjob wrote:
Wed May 18, 2022 10:49 am
Is that a semi-balloon head?

I thought a full balloon head actually had a folded rim with powder space there as well. I'm a bit too young to have ever opened one up though.

Really enjoyed the videos.
The names start getting long and confusing sometimes.
#4 Solid-Head, Semi-Balloon Pocket
download (3).jpg
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