In all honesty, I have not shot airguns and rimfires in over a year (?).
This is the 1st time I have aired and shot my custom PROD, as my GX PCP hand pump was just delivered last Sunday.
I assembled my stainless Don Cothran 2260 PCP right away to test it against the PROD.
The barrel is a 14" LW in .177.
No hammer spring preload.
Hammer spring is a Magnum Air Power .038" WD as well as the stainless valve torx screws (very tight fit on the DC tube I had to polish and grease them).
Transfer port is a that of a Challenger, so the hole is very small.
Starting pressure (tube has no gauge) was 2k PSI based on the hand pump's reading:
In reality, this is really 8 shots; 3 shots are strays from 10.34g JSB's, which made the hole a bit bigger:
I did over 20 shots including my sight in ones and did not notice any drop in the POI.
I built the stainless DC 2260 to emulate the 1720T/1701P, or even the Challenger and it seems to do just that.
I need to buy me a chrono.
There is no doubt in my mind the 2260 will beat the PROD in accuracy, as it was already showing signs of dominance when I pitted them against each other.