I updated the 9mm Titegroup image to show the source of information:
https://drive.google.com/file/d/0B480ew1YmBonVFd4M0NFWGNGTE0/view?usp=sharing
There are charts giving burn rates of different kinds of powder usually sorted by the fastest burning powder down to the slowest. I use Titegroup, a relatively fast burning powder, for my short barrel pistol (S&P 9mm Shield) and a longer burning powder for HK P30 with a longer barrel (often use Longshot). If I use my target load with Titegroup in my HK I get stovepipes. I think there just isn't enough uummph with Titegroup to push the longer action all the way back on the HK. I'd rather use a longer burning powder and make use of the long bullet travel through the barrel, keeping pressure pushing that slide back for a longer time duration, rather than jump up the faster burning Titegroup and building up more pressure. But this is an example of loading for a specific firearm. Commercial ammo just has to hit a medium that will work on everything as much as possible. My Titegroup loads for the S&P Shield goes bang every single time, no stovepipes, no excessive power burn (clean gun). Most reloading manuals give good information on inspecting fired brass for indications of excessive pressure.
Example powder burn rate chart: https://www.hodgdon.com/PDF/Burn Rates - 2014-2015.pdf
https://drive.google.com/file/d/0B480ew1YmBonVFd4M0NFWGNGTE0/view?usp=sharing
There are charts giving burn rates of different kinds of powder usually sorted by the fastest burning powder down to the slowest. I use Titegroup, a relatively fast burning powder, for my short barrel pistol (S&P 9mm Shield) and a longer burning powder for HK P30 with a longer barrel (often use Longshot). If I use my target load with Titegroup in my HK I get stovepipes. I think there just isn't enough uummph with Titegroup to push the longer action all the way back on the HK. I'd rather use a longer burning powder and make use of the long bullet travel through the barrel, keeping pressure pushing that slide back for a longer time duration, rather than jump up the faster burning Titegroup and building up more pressure. But this is an example of loading for a specific firearm. Commercial ammo just has to hit a medium that will work on everything as much as possible. My Titegroup loads for the S&P Shield goes bang every single time, no stovepipes, no excessive power burn (clean gun). Most reloading manuals give good information on inspecting fired brass for indications of excessive pressure.
Example powder burn rate chart: https://www.hodgdon.com/PDF/Burn Rates - 2014-2015.pdf
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