Things are not quite going as planned , and a MAJOR QUESTION ?

[wll2506]

Cue in Kevin Nealon as Subliminal Man.

Good luck tomorrow! _{rear velocity adjuster}.  I'm sure you'll get it figured out _{easy adjustment}.  You'll get it running at high velocity and optimal efficiency _{just a twist of a screw} 

Jason, you are very funny ;-  )

You guys are very correct for easier adjustment for sure, but I'm just stubborn (for now ;- )

I think getting the .300-.350 shim length should get me in the ball park with the '78.

After I shoot the '79 today and empty her tank I will put a few .250 worth shims in her too, as she is already there, but just going to give her a little kick ;-  ) maybe she will give me 815 with Exact Heavies, she is giving me 808 now ;-  )

I hope my next report is all smiles ;- )

wll

[wll2506]

More shims or mod to an RVA. Not to say your 78 is just like mine, but mine is tuned to 840 fps with 18.1 JSB's and can do better if I crank on the RVA. It CAN do it.
Troy

Good going Troy, 840fps with those pellets makes your gun a very serious hunter, congratulations, you are getting some very serious downrange energy even at 75 yds. At that speed with that pellet you can take some serious game !

wll

[wll2506]

I put ~.310 of shims in and to my surprise the bolt would not close ...WHAT !!! Then I took a shim out, and it still would not close WHAT THE ^%#& ... then I took another one out and it is just barely OK ... at .240 length ...

Now I see, I never thought the bolt would touch and yes I very much need a much smaller shim that slides under the hammer hole. I think the shim length is now my endeavor ... .350 to ,375 is probably what I need.

I greatly apologize to all of you who offered advice and I shunned it .... I need to use the wheel, try not to re-invent it !

wll

[wll2506]

Went to Home Depot and got some #10 1/4 long spacers, drilled them out to just fit over the cocking piece spring guide, added three spacers to the back side next to the block itself and then the 1/4 long spacer ... this gave me .375 of extra push. I put it in the the gun cocked just great .... now comes the test.

With sweaty palms and massive heart palpitations ;- ) (I'm trying to build the drama ;- ),    I shot an Exact Heavy ... 848 fps.. the next five shots averaged 850fps ..... I am very happy and this project is close to being done ... except for the "O" ring leak at the cap ... still not enough room and the "O" ring is being cut ... I will fix that.

I now have close to 29fpe with a gun that you guys helped me make .. thank you all  ;-  ) This now will be the King of my "Los Three Amigos" Woods guns. The others are my 177 version of this gun, shooting Kodiaks at 885fps, and my QB79 ... that I is getting 810fps today with Exact Heavy pellets, but is using only about .200 of shim help... I don't know if I will boost her up .. you know why ... safety where I shoot !

My QB79 is a park my car sit on the truck gate and wait for stuff, along with plinking kind of gun ..... where this is there is a farm house 600 yds down from the trees I shoot at ... there are also three other farm houses in the 500-600 yard range. To play it safe 810fps with 18.1 gr pellets is way more than enough, and a matter of fact, I will shoot mostly CPHP's out of this gun as they don't travel as far, yet are fine for 60 yd starlings. This gun will be sporting a 17ci tank next week

Things are coming together. Both the '78 in .22 and the '79 in .22 have an outgoing at the 1350+ range... I think the '78 in .177 is about 1250psi

I have learned an important thing the last couple of days that I really did not pick up on ... and that is the extra hammer speed/power needed to get open up the valve to let enough air in to get pellets moving ... 1350ish psi really does need some extra smack, the difference of ~.120 in shim length made a big difference in velocity  785 that I was getting yesterday day to 850 today !!! I must have been very close to the point of getting that valve open a little more.

BTW: On the .22 '78 I'm using a Disco transfer seal (a la Tim McMurray),  it works just great, almost all of the ice tube seals are to long and smashup when I install them

I'm going to put my QB78 paracord attachment on for the 22ci tank right now ;- )

wll

[mackeral5]

nice work Bill.  I can be as hard headed as anyone else, so I do understand you sticking to your guns on cock on closing.  But I'm sure you will eventually come around LOL..  Tomorrow I may drop the .177 repeater kit on my test mule to see what it does.  It's got a fairly efficient 21.14gr Barracuda Match at 810 fps tune right now, it will be interesting to see what that translates to with just a topend swap to .177.  I've had a tin of 16.36 Barracuda Magnum .177's for several years because nothing I had would shoot them, plan to give them a try.