Well it took ten minutes to install an HDD with great results. To tune as you say takes hours of time over the chrony and a lot of pellets, so its not free. With an HDD I am guaranteed to eliminate hammer bounce no matter what spring preload setting I use. I can go from 35-48 FPE in seconds and get no wasted air, due to bounce. I am pretty sure you can't do this with your "free" tune.
So is your marauder tuned to a certain FPE that insures you get no Hammer bounce and inefficieny? What if your pellets do not not like that FPE? If thats the case, if you use any other setting then your perfect tune setting then your gun is rendered inefficient...
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