DWalt
Member
Technically, lead and copper crushers have a large time constant while piezoelectric gages have essentially none. The time constant is a measure of how quickly a measurement system reacts to an applied force. The crushers take a comparatively long time to react to a sudden step change pressure impulse and miss the peak. Piezoelectric gages react to rapidly increasing and decreasing pressure force nearly instantaneously in real time, and are vastly more precise.Back a few years I did a lot of shotgun shooting which equated to a LOT of reloading. I shot a K-80 in skeet with Briley and/or Kolar tubes. We shooters noticed quite a few split chambers in the 20 ga. Briley did some checking and found that a perfectly safe 20 ga load through the years had really high spikes in pressure when checked by PE testing. Lead crushers never read the very high momentary pressure spikes. They let it be known that we should switch powders in the 20 and 28 if loading Green Dot. . I used Unique or Herco in both and never split a tube. Just an illustration about the differences between crusher pressures and Piezo Electric testing
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