Several have requested that all pressure trace data be placed in one area so that it may be more easily accessed. To that end, please find below almost all traces I have recorded since 10/31/11. Most were done to satisfy my personal curiosity and some were done after someone requested it or to help someone work up a load. A few of these traces have already been posted. Most have not been posted for two reasons: First, IMO, posting all of them individually would be tedious overkill. Second, for reasons I do not fully understand, with the new Bluetooth pressure trace setup, (as opposed to the older USB-connected module) marked variance in curve offset became a problem I dealt with by manually aligning all traces I wished to compare so that the point at which 30% of the peak pressure was reached was close to the same for all traces in one panel. To the few more interested board members who recognized that something was different in the way my traces looked and asked about it, I provided as best I could, an explanation describing the digital alignment process. But, to attempt to do the same for everyone on the SML board IMO, would have (and still may) create more questions than answers. So, I limited the number of traces I posted, preferring to post only traces which provided information specific to questions raised in posted threads and which were not significantly affected by alignment.
The loads shown below were traced from 10/31/11 to the present. Please note that the index lists some traces for which no trace is presented. These are from traces that I never formatted for upload to photobucket. When time permits, I will attempt to add these to the thread. As new traces are created, the present plan is to add them to this thread.
A few disclaimers follow: None of the loads traced are recommended. More than a few of the loads traced were strictly experimental, looking for “proof of concept” and NOT FOR ROUTINE USE. Double charges and even minor variations in small amounts of extremely fast powders (such as Red Dot or CLAYS) may cause unwanted dangerous pressure spikes and may cause severe damage and personal injury or death. All loads traced seemed safe in conditions present at the time the traces were made in my barrels. They may not be so under any other conditions in other barrels. Also keep in mind that pressure values obtained are relative to previously posted loads I used to calibrate this system and may vary significantly from actual pressures or what others may record. There is a significant learning curve associated with production of realistic traces. Be aware that as learning progresses, there may be significant changes in the quality of the data. TG
Pressure Gage and Module Manufacturer = RSI Bluetooth model Glossary: rd = Red Dot, bd=Blue Dot 4759m = old 4759 from metal cannister. 4759p = 4759 from plastic jug. Hblu or HSB = Harvester smooth blue sabot. Hrcr or hrd = Harvester red crushed rib sabot, Hbcr = Harvester black crushed rib sabot. grw = weighed black powder equivalent. Vwool = Lubed wool over lubed .462x.062 lubed fiber wads. veg = fiber wad. A = multiple traces from different panels were manually aligned for comparison.