Measuring pressure (PSI/CUP) for a new cartridge

[ClemBert]

Where does one go to have the pressure measured when dealing with a new cartridge or a configuration different from what has been tested in the past. Is there a lab that specializes in this? If so, what is the process and cost?

 

[evan price]

http://www.hpwhite.com/

Not cheap.

 

[ranger335v]

"Where does one go to have the pressure measured ..."

HP White Labs. Do a web search and contact them for current prices.

 

[ClemBert]

I will contact them. Thanks. In the meantime....

I came across a description of a software package called QuickLOAD, an internal ballistic predictor. I wonder how good a job it does. Has anyone here used it in the past?

 

[USSR]

Yes, QuickLoad is a popular software product to "estimate" pressure, which can be very helpful in load development where there is little to no published data on a particular bullet/powder load combination.

Don

 

[918v]

QL is accurate within 5% of actual pressure with bottlenecked rounds. If you have a lab rest your ammo, their results will not match your gun exactly either. Their gun is different from yours. Alot of variables affect pressure. Peak pressure, also, is not the only consideration.

 

[ranger335v]

To get some idea of just how "accurate" computer projections are you need to watch the daily weather reports and note how broad the projected paths of hurricanes are. And understand that the NWS has millions of dollars in equipment and programs plus thousands of people working hard to give us erronous information. IF YOUR input data actually matches what the programmers used for a model it can be fairly accurate. Otherwise it's as good as a typical weather report. Or a stock price projection. Or a projection of what the economy will do next week. Or ....

 

[MrOldLude]

To get some idea of just how "accurate" computer projections are you need to watch the daily weather reports and note how broad the projected paths of hurricanes are. And understand that the NWS has millions of dollars in equipment and programs plus thousands of people working hard to give us erronous information. IF YOUR input data actually matches what the programmers used for a model it can be fairly accurate. Otherwise it's as good as a typical weather report. Or a stock price projection. Or a projection of what the economy will do next week. Or ....

Then you probably shouldn't fly.

There's a big difference between predicting a storm's path and modeling the pressure spike of a rifle cartridge with a known internal volume, and a known quantity of powder, with known burn characteristics.

 

[918v]

To get some idea of just how "accurate" computer projections are you need to watch the daily weather reports and note how broad the projected paths of hurricanes are. And understand that the NWS has millions of dollars in equipment and programs plus thousands of people working hard to give us erronous information. IF YOUR input data actually matches what the programmers used for a model it can be fairly accurate. Otherwise it's as good as a typical weather report. Or a stock price projection. Or a projection of what the economy will do next week. Or ....

We're not talking about the weather. QL has been tested against pressure equipment. Maybe you should not reload either cuz the pressure equipment does not match your gun exactly.