XS60C PCP Repeater project

[stalwart]

Messing around with the adjustable single shot, and got a couple 5 shot strings on 1.5K air (stock tube):

0*: 598,602,593,582,576... took 10 pumps to refill.

WFO: 872,865,843,813,782... took 14 pumps.

As a "garden guard", it will work fine. If there is anything left around after 5 shots... I'm not worthy, and whatever is still there qualifies as profoundly handicapped (it's freakin loud!). I'll get a rake, and push it out, before anyone sees us fumbling about. 

This guns stays. With the reflex, I can hit with both eyes open... and CPUMs can literally be dropped into the chamber. For gallery shooting, I'll run it on bulk CO2, carts for outdoor plinking, and sitting by the door 1.5K will be perfect. There is a gopher out there I'd like to intro to HPA.

[avator]

Sorry for the quick interuption, I just can't help myself...... MY P-!7 IS FREAKING AWESOME !!!! Thank You Stalwart !!!! ....that is all.

[stalwart]

You're certainly welcome, Bill!    Frankly, it delights me every time an experienced shooter finds out what makes these so special... and in this case I got a twofer!

[RMM]

I would like to see your guerilla tank setup. Please share a pic with details and costs.
thanks

For all ye seek ye might as well go to the rsterne original write up,  reply #46 in this thread http://www.gatewaytoairguns.org/GTA/index.php?topic=62302.40

I found the Guerilla 22ci tank on clearance in a Goggle search, the old style Ninja regulator was found on clearance also then boosted to 1.5K using another rsterne thread. http://www.gatewaytoairguns.org/GTA/index.php?topic=40074.msg377677;topicseen#msg377677

My pics, then back to the scheduled repeater project.   

[stalwart]

Got some time in on the adjustable single shot... the striker was shaving aluminum, and the gun was locking at ~1750psi. I dropped a coated striker in... doesn't lock @ 2000 psi (high as I intend to try), and after a few rounds of watching the speeds go up (as the Teflon filled the chewed aluminum), it hit it's max. 946,953,967,968,946. It's hanging around 28fpe with CPUMS.

This thing is ready for somewhat bigger pests than I had expected. 

[stalwart]

I've got a 500psi difference in the gauge readings between the FDAR pump and the JDS tank.

Is this unusual?

[rsterne]

I can't read the numbers in the photo, but the mini-6K tank gauges aren't very accurate.... The only way to be SURE is to test the gauge on the pump vs. a known gauge....

Bob

[stalwart]

I don't have anything known to compare to, but I did mount a new McMC 4k gauge, and it reads about 20% less. I guess the smart thing to do is to use the FDAR gauge for now, as the benchmark, as it's likely to be the safest. I have to deal with this, though... my resultant numbers may be very conservative.

At 1.8K (?), I'm running 5 shots at ~28fpe. That seems to be pretty peppy! With this gun, I won't need hyper accuracy measuring the charge, but for experiments, I'll need something better.

Any suggestions?

[Gertrude]

Eric,
Check your PM's.
If you think that might work, Feel free to post it up in the thread.

[stalwart]

That will work. I'm on it.

Guys, Ron uses an adapter to hook his pump into a dive shop's calibrated setup, to compare readings. I'm a little inland to have a dive shop nearby, but I have friends (including a diver) in Morro Bay. It will be a while, but I'll get results, and post.

Thanks, Ron!

 

[Gertrude]

That will work. I'm on it.

Guys, Ron uses an adapter to hook his pump into a dive shop's calibrated setup, to compare readings. I'm a little inland to have a dive shop nearby, but I have friends (including a diver) in Morro Bay. It will be a while, but I'll get results, and post.

Thanks, Ron!

 

Just to clarify, It's not my pump that the dive shops use my adapter for.

I told stalwart about my Male/Male Foster adapter that the shops use to fill my SCBA tank.
In other words, they fill my SCBA tank THROUGH the same hose/gauge setup, that connects my tank to my PCP's.
 I got the adapter from Tim at Mac-1, when I bought my tank from him.

This might be a idea for all of you who use Hand Pumps,... and want to verify if your pumps gauges are reading accurately.

My thinking is, that the dive shops regularly have their compressors/gauges checked for calibration, due to the fact that they are filling Dive Tanks all the time.

 By taking his Hand Pump to a dive shop, and using a Male/Male Foster adapter to connect the Hand Pump to their Filler Hose, he can then pump the Hand Pump up to a given pressure, thus pressurizing the shops Fill Hose.
 This would then read out on the shops compressor gauges, and he can compare what the Hand Pumps gauge reads vs. the dive shops gauge.
 Any variation can be noted, and then give a better idea of the actual pressure he is putting into the rifle.

of course, you'll probably have to talk to the shop manager to have them allow you to do this, as a regular employee may not quite feel comfortable letting you **come behind the counter**.
 So be nice when you ask, and offer to by him lunch of at least offer him $5 bucks for his time.

I get my tanks filled up at a sporting goods store called "Sports Chalet". They have many locations here in Kaliforniaistan. They all have a large Scuba Diving department, and they all have 4500psi commercial Bauer compressors. It cost me $5 to fill a tank.
 Doesn't matter if it is my 88 cu ft, or my peanut tank, or if they are empty, or if it has some pressure ... it is still $5 bucks. No problem.
 I normally DO still have 1600psi or so in it, due to I've only been using it to fill my 2 Mrods.
 My "sweet spot" ends around 1650-1700 psi, and I don't yet have a chrony, so I can only judge this when the poi starts to drop,  so to play it safe, I normally top them off when they get down to around 1800-1750psi.

(BUT NOW THAT I HAVE A XS60C... Yay !),....
 .... they will probably be seeing my tanks down to around 600-500psi. LOL.

ok, not trying to change the course of the thread, so back to our regular programming 

Hope this might help any fellow members.

[Gertrude]

That will work. I'm on it.

Guys, Ron uses an adapter to hook his pump into a dive shop's calibrated setup, to compare readings. I'm a little inland to have a dive shop nearby, but I have friends (including a diver) in Morro Bay. It will be a while, but I'll get results, and post.

Thanks, Ron!

 

Or, maybe go to your local Fire Department and ask where, or who, they have to fill their tanks... and go there to try it.
Just a thought.
[on edit]
Oops,... they probably don't use Foster fittings to fill there tanks.
(nevermind)

[stalwart]

Ron, thanks for spelling it all out. Useful post, for sure!

Guys, the cheapest precision gauge at McMC is $100... in case you wondered. LOL... to many of us in Kaliforiastan, that's become significant money (you can push your truck's gas gauge past halfway with that kinda bank!).

[RMM]

Ron, thanks for spelling it all out. Useful post, for sure!

Guys, the cheapest precision gauge at McMC is $100... in case you wondered. LOL... to many of us in Kaliforiastan, that's become significant money (you can push your truck's gas gauge past halfway with that kinda bank!).

I couldn't find the words so I'll let someone say it.  http://www.network54.com/Forum/79537/thread/1132692918/Pressure+Gauge+Accuracy

I'm currently looking at two of these http://www.mcmaster.com/#atmospheric-pressure-gauges/=s1zb0b , one in 3K and one in 6K with a 1% +/- mid scale grade A.  I'm already using a Harbor Freight gauge, LOL!!, hooked up to my remote filler whip and I haven't blown a 1.8K burst disc yet, another LOL!!, so purchasing the two McMC gauges I have pretty much a mid range reading for the airgun pressures we work in.  Here's pics of my whip setup, this will also work on with the pump filler whip to verify the pump gauge.

[RMM]

As far as the Bobcat I'm making progress with its tune and a bell curve. 

1.5K down to 1K  (I also setup and am using a 13ci Ninja tank with Ninja reg set to 1.5K using the HF gauge setup.  I'll switch the reg to the 22ci bottle when or if needed. )

.046" shim behind 3 - #113, 70 duro o-rings for Bstaley.  (.131 valve stem protrusion from striker block)

trigger group full forward (Low Power adjustment)

adjuster all the way to rear (Low Power adjustment)

14.3 CPHP

probe bolt (stalwart's)

teflon coated striker (stalwart, I'm thinking your teflon coated bolt STRIKER is making a BIG difference! You ought to sell them)

18 shots, 730.12 average, 4.2% ES, 16.9 FPE

I'm trying for the 20 FPE range with hopefully 16 accurate shots with OEM barrel. 

Any and all input will be greatly appreciated, as a matter of fact I'd never be this far without all your generous input.   

[avator]

As amazing as this is, I choose to go the uber technical route. I fill the gun til the cheap guage says I have somewhere between 15k and 16k (depending on lighting and blood preasure) and shoot it til it mouse farts, then I fill it again. I must admit, I spend way too much on pellets and little dime sized stickers. But please continue... it makes for great reading.  LOL...... just kidding guys.

[Big Bore Bart]

   The next thing I would do is, use a caliper and start moving the trigger unit aft, (in say .020" increments) until it hit either 20 fpe or 16 shots within 4%.  (Or full back.) 

[stalwart]

I promised myself that when the first order for a .177 came, I'd twin it and keep one for myself. Done... and, done! 

Would someone please explain to Bill that air guns were never meant to be shot for pure enjoyment, and that if you aren't pulling out precious hair while obsessing over numbers that can only be found using electronic equipment... you're doing it wrong! Please?

 

[RMM]

   The next thing I would do is, use a caliper and start moving the trigger unit aft, (in say .020" increments) until it hit either 20 fpe or 16 shots within 4%.  (Or full back.)

I will do this.  Thanks.

[silent_airman]

I promised myself that when the first order for a .177 came, I'd twin it and keep one for myself. Done... and, done! 

Would someone please explain to Bill that air guns were never meant to be shot for pure enjoyment, and that if you aren't pulling out precious hair while obsessing over numbers that can only be found using electronic equipment... you're doing it wrong! Please?

 

Ignorance is bliss, and I am very blissful in regards to numbers and having fun being ignorant!