Well I went ahead and tuned the Benji before the Easter weekend. This rifle and the Phantom 500 use the same piston. I ordered the Phantom 1000 piston and like I did with the Phantom 500 , swapped out the piston and did a quick tune up on the rifle. I had problems not being able to separate the barrel from the receiver forks. So I had to do the tune with barrel attached, which required me to be a bit more careful so as not to damage the gun. This also meant I was not going to use a spring compressor. Removing the spring and piston was not that difficult without the compressor, however putting it back together required some effort. If I had the assistance of another pair of hands it would have been a breeze to keep pressure on the receiver while I lined up and pushed back the retaining pin. Ah well I got it done. I have to say that this gun unlike the Phantom was absolutely soaking in lube when I opened her up. It was dripping!
Anyway on Easter weekend I went up north and did some target shooting and chronied her up .
Here are the post tune readings.
Benjamin Hollow points 14.3 g
675.3
687.7
681.9
671
676.1
678.4 avg fps
RWS Hobby 11.9 g
735.6
736.4
734
735.4
738.5
735.98 avg fps
Crosman pointed 14.3 g
678.1
671.1
672.6
674
672.9
673.74 avg fps
So as you can see I got pretty much the same results as I did when I did the Phantom 500 tune. Im contemplating adding a few washers to squeeze out a litle more power but I find myself with little time to take it apart again at this point. Instead what time I do have I like to shoot this rifle. Even though the powerplants are the same as the Phantom 500 I can honestly say that this gun is a much nicer gun to shoot. I find it to be very accurate as well. At this time Ive only punched paper targets and soup cans.
Next up shot sitting at the bench same distance 27'. Started using the RWS Hobby pellets then switched over to Benjamin Discovery Hollowpoints for the last eight.
The Benjamin Discovery pellets had a few fliers, check out shots 17, 18,19. Also noticed from the holes that it looks like it's not hitting the paper as cleanly as the hobby pellets. I will try another set strictly using the Benjamin pellets to see more results. 
