Learning to Decipher PT’S
Jan 30, 2015 18:37:22 GMT -5
Post by ET on Jan 30, 2015 18:37:22 GMT -5
With what little technical knowledge I have in this area I have been trying to get a better understanding from the info a PT provides. Of course the main interests to most are the peak pressure and the ES. Two different areas I’m also focusing on is the RISE and AREA info. As I will hopefully be moving into duplex loads this year I’m trying to put together what I believe constitutes a good guideline to follow.
Rise
Represents the rate at which peak pressure is obtained. A numerical number is assigned to represent this rate with a higher number showing a slower rate and a lower number showing a faster rate. For my own purpose I have assigned 100 as a division line between sabot and sabotless shooting. Above 100 is more desirable for sabot shooting because it should be less disruptive to the sabot.
Rise can be easily altered by the choice and amount of booster employed.
Area
This number represents the overall amount of pressure the bullet is exposed too while in the bore. The higher the number the higher the resulting velocity is usually the rule here. For a standard load IMO a value of 2000k or higher is better to have.
Area can be easily altered by the choice and amount of main powder employed.
The fun part is combining Peak Pressure, Rise and Area to get you on the node or sweet spot for your SML.
TG has graciously provided numerous pages of PT’s with a wealth of info for us to utilize. This info was not available in the past until TG took it upon himself to generate these traces for our benefit. From my viewpoint we owe him a special thanks for his contribution.
I personally have downloaded this file with linked traces. There are 14-pages of listed traces so if you click on the trace you want to see it automatically takes you there. Then to go back to the list you click above the trace where the load is mentioned. Because there are 14 pages of listed traces you can quicken your search by itemizing the traces with a check mark beside it for future reference. Now you also can add notes with additional text to the Trace Page or Trace List. Just click on “SIGN” in the above tool bar and you are on your way.
Below is a picture of how I quickly identified the 50 Cal loads with a check mark on the list and a one word text for one load. This helps me to easily navigate through the list and added notes refresh my memory from a previous viewing.
TG this is one individual who greatly appreciates the work you’ve done and benefits from it in many ways.
Ed