First let it be known what I am about to do in no way is to subtract any credit from TG who did it right. His work was excellent.
What I hope to do is more for myself to have a better understanding of powder burn characteristics by corelating given knowns found in PT trace. The PT program already provides us with what we need to know but I would like to see if this program's capabilities can reveal a little more. Here I want to divide the decline slope into 2-parts. The Burn Out Phase where the sharp pressure drop begins to level out and the Carry Phase with the remaining pressure that carries the bullet to the exit point. While sitting quietly here and enjoying a diet pepsi (maybe one too many, chuckle) I got a feeling to further explore pressure traces and see what they might possibly offer. Now here the PT's program has some additional features (cursors) and I feel they are there for a reason. But to utilize them I would need original trace files in the PT format to get more accurate info. As TG is no longer with us it looks this will be a long ongoing personal project. Below is one of my original trace of 45gr 4759 with a 250gr bullet with the employment of cursors. The red line arrow is a separate addition just to signify the length of the Carry Phase. For now I think I will have another diet pepsi.
While waiting for my connectors for strain gauge assembly I started to get organized with how I want to present my results. There might be some additional info included yet. The reason I need to state BP recess because I also have a 3/8" recessed plug. Sorry no standard BP here because of my belief what the recessed BP provides in the way of dependable ignition. As for mention of load resistance is to see what pressure response will occur. The other areas of interest that I have will be in my hidden notes. If something is important to share it will be shared. Here I hope to keep all the necessary data I want in one location. It may still be a while before I get rolling on this getting all my preparations done and slotting range time. Now time to get creative for a better sun shield for my chronograph. Hopefully utilizing an umbrella isn't necessary but if that's what it takes so be it, chuckle.
Looking back at previous traces I found one showing 43gr 4759 which I believe was with the old 4759 that produced 35k pressure. That trace was done by RB, yes RB did the first PT's for muzzle-loading. With the new 4759 I found going up to 46grns made a slight difference in group size. If I remember correctly Herman even went a little higher for a better response. The tragedy is 4759 is discontinued.
It may be discontinued but there are not that many old school sabot shooters left . Before I retired a few years ago I stocked up on shooting supplies ... fortunately 4759 was still available and I picked up several pounds . Chris