P-Max internal ballistic calculator.

I just found this. It seems to work ok. How accurate is it? NFI

You should still check a powder manual IMO.

https://www.p-max.uk/cgi-bin/pressure.cgi

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Originally Posted by Oldbloke

I just found this. It seems to work ok. How accurate is it? NFI

You should still check a powder manual IMO.

https://www.p-max.uk/cgi-bin/pressure.cgi

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Greetings,
Yes check with actual load data but more importantly chronograph your loads to see if your actual velocity matches that predicted. If you get more velocity you are getting more pressure and less with less. There are a bunch of variables that can effect your actual results.
GPM.