American Air Arms
HAM Marksman
Last edited:
As we enter into the ultra performance realm with infinite tuning available to the shooter the need for baseline tunes (I really dislike the word tune) will be invaluable. Understanding where to start and what are the effects without extraordinary efforts will save time and frustration for all.
I have started with the 300 hps with an 18" barrel, medium plenum extender, and pellet barrel. This spreadsheet is mostly for us to work out the testing methodology. At some point the spreadsheet will be converted into tables on our website. More calibers, barrel lengths, and types will be added as we put them into production. I'm open to suggestions on the information you would like to see presented on the spreadsheet.
A few notes:
Hammer spring was not adjusted during the tests, only the reg pressure and the valve dwell adjustment.
The 56gn ZAN takes a large efficiency hit; completely expected.
Power and shot count with the 44gn JSB are measurably higher than the standard EVOL 30.


I have started with the 300 hps with an 18" barrel, medium plenum extender, and pellet barrel. This spreadsheet is mostly for us to work out the testing methodology. At some point the spreadsheet will be converted into tables on our website. More calibers, barrel lengths, and types will be added as we put them into production. I'm open to suggestions on the information you would like to see presented on the spreadsheet.
A few notes:
Hammer spring was not adjusted during the tests, only the reg pressure and the valve dwell adjustment.
The 56gn ZAN takes a large efficiency hit; completely expected.
Power and shot count with the 44gn JSB are measurably higher than the standard EVOL 30.





