For the smokeless powder gif, I took the best shot, the best that matched the average pressures from a ten shot group. The curves prove, for this cartridge, that there are no “pressure spikes” unless one uses fast burning pistol powders at higher than published loads, or for loads that require the use of stronger action rifles.
For the black powder gif, I combined what I could that gave a clear distinction between the years of manufactures…pre-1884, post 1884 and modern. These are years years of which the cases gradually lost the deep balloon pocket which appears to aid in higher pressures in black powder loads.
This screen shot shows the fast vs slower powders, the length of time it takes to complete the burn.
Give the gif time to load, it has been slowed down to 3 seconds per frame.
This screen shot of the black powder gif shows just how much pressures original loads actually produced compared to todays loads. It also shows the length of time it takes to complete a burn. The hotter load retained higher pressures through the duration of the burn.
By conducting pressure testing shots and measuring the barrel expansion with a strain gage. Over the past couple years I made a minimum of 930 shots, 93 tests. I managed to attempt to learn how to take the information and work up gifs in GIMP and make some youtube videos and just make a mess, in general, of everything.
Myth
The older balloon pocket cases through the 1930’s were strong, but weaker than modern brass
This is the only failure I had during all of my 930+ shots tested. Of course I did not use these for all tests. However, this was done with black powder. I never tested smokeless powders in these type until recently which were not reloaded. I used old factory brass that was never fired.
In the beginning, Winchester did not want anyone reloading smokeless powder loads, but said if you did to use extreme caution.
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