I have a Pressure Trace with strain gauge.the first bought in 2005,direct wired, and failed this year.The second, wireless Blue Tooth and just installed.I reported results in 2005 and received comments about calibration and tried to explain how that is done with a strain gauge.Some just cannot understand,but if you wish,go to the Pressure Trace site and read or have someone read it to you. Anyway,the curves are as described above and I will need to print them out,use my planimeter (a very good one )and maybe report(slower is lower at the chamber,but higher further down the barrel when compared to faster) .Today,the experiment is to base line new AA's-6453,6403,5798,6151;5949 psi.The curves look to be the same, but peak at:.45 for one,.6 for three;.8 for one.This all in millisecs as the PT measures in 1/10,000th sec intervals for a three millisec total.Next, the same shells will be reloaded,shot,reloaded,shot,etc. to see if there is any change in pressure etc. as shells are reloaded many times (I think crimp may be a problem).BTW, Armusa low pressure are(5000 psi),Wallyworld are not(hot);fast is faster than slow but not alot( sorta like the first place Olympic 100 meter guy is fast and the fourth place guy is slow)
