Excitement

[sholo]

Wouldn't mind improving on those strings though. It doesn't sound like it's hammer bouncing. Thoughts, comments, anyone?

You could get yourself some 1/4" Teflon rod and make some TP's of various sizes? Velocity will drop a bit (how much will depend on how small you make TP) but your string should flatten out, gaining a few shots in the process.

SeanMP posted a good thread on TP sizes for his '78. His is .177 mind you, but the principal is the same: http://www.canadianairguns.com/showt...of-a-QB-on-HPA

Hopefully Sean or Bob will chime in with a more accurate analysis than mine for you!


Todd

[Doc Sharptail]

You must be an early riser. Thanks for the input.

After sleeping on things for a bit, there's still a lot to do.
I will try increasing fill pressure a bit more. I may need to re-think how much I flow the valve as well. I'm very close to where I want to be...

I'm no where near the 200 bar that Bob mentioned, and by the look of things, won't have to go quite that high. The tube I'm using is 3K PSI rated, so there's still a bit of room to work with.

I'm almost certain that the next build is gonna be .177, and the learning curve's still a bit steep.

Regards,

Doc Sharptail

[Gippeto]

Simplest version I've seen...took some digging, but heeeeerre it is.....


http://www.network54.com/Forum/79537...t%3B)+adjuster.

[Doc Sharptail]

I spent a great deal of time on the hammer tonight. I took a diamond cloth to it, by hand, and got it cleaned up to where it will move freely in the tube.



It's an investment casting, and a pretty poor one at that. It is very porous, and badly burred from where the cast was broken away. By the look of it, the hardening process was near the end of it's useful cycle- warm water. The rust in the spring pocket probably didn't help matters much. That dent in the rear portion looks like a tong mark to me, but there's none on the other side.

The roll-over sear binds too. I was too played out to deal with it tonight. There's a long week-end upon us, and I'll probably get time to work on it tomorrow night. I'm not in the least bit phased by this. I'm hooked badly by this new experience.

Regards,

Doc Sharptail

[Doc Sharptail]

Coming into the home stretch, now.
I'm getting 10-shot strings. Got to thinking a slightly heavier pellet would help the gun to settle in. Used up some of my dwindling supply of the 18.1 gr JSB Exact Heavy. I really gotta find another source for these, or an equivalent. I like their accuracy.

JSB Heavy Exact @ 1800 PSI

1.) 728.7
2.) 727.9
3.) 720.5
4.) 729.7
5.) 714.3
6.) 716.6
7.) 703.6
8.) 698.2
9.) 698.8
10.) 688.6

The gun almost wants to level off. I think I need to shoot the heck out of this gun. So close now!

@ 1900 PSI, same pellet:
1.) 748.4
2.) 753.3
3.) 596.0
4.) 746.0
5.) 737.1
6.) 733.1
7.) 734.7
8.) 723.3
9.) 720.4
10.) 712.1

@ 2000 PSI, same pellet:

1.) 749.9
2.) 739.3
3.) 751.5
4.) 730.6
5.) 744.7
6.) 743.3
7.) 737.5
8.) 730.8
9.) 724.1
10.) 718.5

This is getting better. An extreme variation of 30-35 fps is something to crow about! I'll be able to quit posting strings soon.

A few thoughts:

I badly want to do this again, in .177, with throttled back flow. The .22 is nice, but a little on the loud side for indoor use. I'm still gonna shoot the heck out of it- outdoors.

High pressure does strange things to O-rings. I need to get more O-rings for the fill yoke. They can only be installed, used , and removed once. They come out badly dried and compressed.

The gun is a lot easier to pump with a reserve of 1.2-1.3 K PSI in it. Am I going to be o.k. storing the gun this way? It's usual storage place is cased, in my vehicle...


Regards,

Doc Sharptail

[Doc Sharptail]

Thanks, Bob. Hopefully, I can get out tomorrow for a shoot, somewhere. I'm beginning to understand why so many opt for the bottle, tank, and shoe-box thing.

I hope I can make it into the gravel pit. There's an awful lot of snow to be melted here, yet.

This has been a major step for me. It's way better than what I was doing before with the 13-XX's (which still hold a place in this old heart). From a hunter's view-point, I've almost arrived!

Getting very close to the old .22 short CB cap 29 gr...

Regards,

Doc Sharptail