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Post by sew on Nov 24, 2022 17:10:19 GMT -5
I see occasional references to pressures often given as amounts of powder and bullet weight as being safe for various types of rifles. This is a very valid subject. Quick Load will calculate pressures , correctly or incorrectly. Personally, I think the peak pressure is less but the duration is longer. But, of course, I may be wrong.
Still, the question remains: “What is the maximum safe pressure for the various types of builds?”. Personally, I think Savage’s very conservative pressure guidelines may be affecting what we think is safe today.
Thoughts on pressures?
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Post by Kyle on Nov 24, 2022 17:50:21 GMT -5
In reference to Quick Loads, the value entered into the Weighting Factor block will change the predicted peak pressure value. I generally leave the weighting factor value set at .50, even if the rifle has a chamber. For a .45 with HIS ignition, 1.250” x 5” shank, 52-53k. With hard modules, more but proceed with caution. Pressure goes up as temperature increases. A load worked up in cold weather deemed safe may blow modules in hot weather. Everyone remember QuickLoads is an estimate, and is not the same as a calibrated strain gauge.
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Post by dannoboone on Nov 25, 2022 13:53:15 GMT -5
In our muzzle loaders, would not bullet fit in the barrel also be a factor? A "pound down" surely produces much more pressure than one which practically drops down to the powder, given the same load. Either one could negate a Quickload estimate......or not?
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Post by Kyle on Nov 25, 2022 14:43:05 GMT -5
In our muzzle loaders, would not bullet fit in the barrel also be a factor? A "pound down" surely produces much more pressure than one which practically drops down to the powder, given the same load. Either one could negate a Quickload estimate......or not? Between a drop down the barrel fit and a pound down the barrel fit, I’m sure there is an increase in pressure. A hammer down fit is still a far cry off from the pressure spike of a full bore bullet being fired in a centerfire. Quick Loads has a block to adjust and allow for “friction proofing”. This value can be set as low as .40 . Quick Loads is not designed for muzzleloader applications, but it is a good tool to use once the user becomes familiar with how to modify the inputs for that use.
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