I read the article and the Benjamin Marauder Owners Manual.
The owners manual seems to indicate that the Hammer Spring Preload (tension) and Hammer Stroke (distance) are used to tune the gun for different fill tank pressures. The metering screw is used to tune the pellet velocity.
The article indicates that the Hammer Spring Tension and the Hammer Stroke Adapter are used to tune the pellet velocity. The Transfer Port (Marauder metering screw) to fine tune the velocity. But the article seems to indicate you adjust the Transfer Port more to make your gun efficient than to adjust the pellet speed. If the Transfer Port is not adjusted properly, you will lose speed so in essence you adjust the port to an inefficient setting to slow your pellet down. Of course this costs more air and less consistent shots in a string (I would guess).
Is each Marauder unique in how it should be tuned? It seems their should be some research that provides good setting for Marauders as a general rule. For example, I want to shoot my Marauder from 10 to 55 yards using heavy pellets. I am only interested in the guns accuracy. It would seem that, that profile is shared by most owners so a tuning solution for one would probably be good for all. That is, unless every gun performs a little different. Then the question is, how much different.
I would guess putting a regulator in a Marauder does not have an affect on the tuning mentioned above. The regulator would just make the input pressure on the Hammer Spring Preload consistent. So if I were to set the regulator to 2000 psi, I would set the Hammer Spring Preload tension and the Hammer Stroke distance to a value that works best for 2000psi. Without a regulator, I would set the Hammer Spring Preload tension and Hammer Stroke distance to a value that is a little over half the distance between the fill tank stating and ending pressure. For example if I fill to 3000psi and run it down to 2000psi I would tune the gun as if it were at a consistent 2600psi.
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