A 1377, PC77 & A 1322 on the Chrony

[Crosshairs]

Good sound advice... in looking back at the video, id did sound like I was in a hurry... probably the memory on the camera - heck if that excude don't work, I've got more 

Seriously though, I do need to slow down.  But I must say, I pumped all three pistols the same amount, and it was the PC77 that generated the most heat... I wonder if it is because it has a newer piston cup(?)

It could just be a very tight seal, is the piston will oiled if it's dry it will cause more friction and you will get heat from that.
                                                                         Mike

[arkmaker †]

Heat em up boys! I want to see them glowing red! 

But, does the heat cause a change in velocity or is it just a wear thing?

[1377x]

Heat em up boys! I want to see them glowing red! 

But, does the heat cause a change in velocity or is it just a wear thing?

both!

[DRAGON64]

It could just be a very tight seal, is the piston will oiled if it's dry it will cause more friction and you will get heat from that.
                                                                         Mike

A drop or two of oil, and I did not notice a difference.  I did slow down, but 25 - 30 rounds I needed to give her a rest.  I did notice though, that the drop or two of oil caused the pistol to build more pressure.  Closing the pump arm after each pump really became tough to do...

[NorthStaR]

I reckon that's the better seal your getting? 

[DRAGON64]

I reckon that's the better seal your getting? 

I know that dry firing to remove excess oil would blow nice sized holes through a paper towl from 7-8 inches away... dry firing wasps from point blank range would either knock them silly or pop their antennas off... 

I need to remain in vigel in keeping one pump in the pistol to keep the seals expanded.  All of my pistols seem to loose their pressure after sitting while pumped.

[1377x]

the slower you pump the more stable the pressure
i can pump my guns 10x,let it sit overnight,velocity remains the same
the key when pumping 15-30x is take a break after 10 pumps,pump slowly

[NorthStaR]

I know that dry firing to remove excess oil would blow nice sized holes through a paper towl from 7-8 inches away... dry firing wasps from point blank range would either knock them silly or pop their antennas off... 

I need to remain in vigel in keeping one pump in the pistol to keep the seals expanded.  All of my pistols seem to loose their pressure after sitting while pumped.

I had a pellet stuck in the barrel and popped it out with a kebab (kebob) stick and in a moment of distraction I forgot it was there. Mainly cause I had to push one with another and forgot to remove the one I couldn't see.

I did a dry fire and sent a would'be blow-dart accross the hall.

Ooops!!! It was surprisingly accurate considering it had no flights attached or wadding! 

[DRAGON64]

I had a pellet stuck in the barrel and popped it out with a kebab (kebob) stick and in a moment of distraction I forgot it was there. Mainly cause I had to push one with another and forgot to remove the one I couldn't see.

I did a dry fire and sent a would'be blow-dart accross the hall.

Ooops!!! It was surprisingly accurate considering it had no flights attached or wadding! 

very interesting... a 13XX dart gun!  Great for taming and not mameing unruly pests And it's retrievable... carbon fiber rods... Nah, non-intended useage.

[1377x]

very interesting... a 13XX dart gun!  Great for taming and not mameing unruly pests And it's retrievable... carbon fiber rods... Nah, non-intended useage.

they have been made to shoot tranquilizer darts.i saw one at the gunshow i went to.it was made by daq
it said on the side daq tranquilizer gun. $205

[DRAGON64]

I modified the 1322 that I was tesing in this thread, by installing an AC Custom piston and valve.  My 1322 was shooting 469 fps, now see what this small upgrade has done for my pistol:

[youtube]https://www.youtube.com/watch?v=QU2JVGXtZL8&feature=channel_video_title#]1322 Chrony Testing 9-10-2011[/url]

Lots more work to be done to smooth this pirtol out.

[1377x]

nice numbers for a 10" barrel!

[quickster47 †]

Couldn't watch the video yet but were you using the same number of pumps?

If so, that's an impressive gain.

Carl

[DRAGON64]

Yes, 10 pumps for the first go around.  Once the o-ring seats in, or something loosens up, I will not try the 15 pumps just yet.  One item to note; I picked up the pistol later that day, only to find that the breech had loosened up... made me wonder just how well of a seal the breech had to the barrel.

[1377x]

using a heavy hammer spring would loosen my gun up!