Flying Dragon XS60C PCP data

[selittle]

I also went out and got an interesting shot group and some target practice in at 25 yards.  Still shooting smaller than dime size groups (5 shots).  For target I was shooting the 18.1 grain JSB diablos, and the chronied shot string was 14.5 grain RWS superdomes, average fps over 22 shots was 833.7, 22.3 fpe, with 18 shots at 800 fps or over.  So I am happy with that string.  I also shot some at 50 yards, but the JSB's didn't hold a great group, about a 3.5" drop from 25 yards and 1.5" group.  Gun was at 1750 PSI. Enjoy. 

This is re-post from the FD-PCP info section that has been taken over by trolls.

[toine]

Thanks for sharing Scott. Looks encouraging for sure. I'm curious though, have you tried it at a lower pressure at all? You will end up with less shots for certain, but you may be able to zero in on that 'sweet spot' on the curve, shots 7-14 or so. I can't wait for mine to get shipped out so I can start contributing as well.

[selittle]

Thanks for sharing Scott. Looks encouraging for sure. I'm curious though, have you tried it at a lower pressure at all? You will end up with less shots for certain, but you may be able to zero in on that 'sweet spot' on the curve, shots 7-14 or so. I can't wait for mine to get shipped out so I can start contributing as well.

Yes I have.  At 1500 PSI my plateau is about 2 shots and I only have about 10 shots that are above 700 fps.  With a quick drop of in fps. 

[cwlongshot]

I also went out and got an interesting shot group and some target practice in at 25 yards.  Still shooting smaller than dime size groups (5 shots).  For target I was shooting the 18.1 grain JSB diablos, and the chronied shot string was 14.5 grain RWS superdomes, average fps over 22 shots was 833.7, 22.3 fpe, with 18 shots at 800 fps or over.  So I am happy with that string.  I also shot some at 50 yards, but the JSB's didn't hold a great group, about a 3.5" drop from 25 yards and 1.5" group.  Gun was at 1750 PSI. Enjoy. 

This is re-post from the FD-PCP info section that has been taken over by trolls.

Thanks for this post Scott!

With a little luck those trolls have had there fillers jerked and leases shortened. Everyone deserves and opinion but when some seem to just jump all over any neg point or issue it gets old fast!!

Anyway enough on that. It's best not to feed and simply ignore them.

I'm looking to improve myown shot string Bob made a post eluding to a couple things in that thread and I am awaiting his reply.

CW

[rsterne]

Who, Me?.... Maybe I'll make you wait until I get my FD-PCP.... it's on order as of this morning....

Bob

[cwlongshot]

Who, Me?.... Maybe I'll make you wait until I get my FD-PCP.... it's on order as of this morning....

Bob

You better share those cookies Bob. If not, I won't bring anymore milk!

CW

[rsterne]

Already did....

Bob

[cwlongshot]

Already did....

Bob

Thank you.

[SlickWilly]

My Chrony data. done on 04/06/2014 and 04/09/2014.  FD PCP in .22 cal Shooting CPHP 14.3gr




The first 5 tests were done with stock setup which was 1/2 turn on the power screw and the barrel/tube band tight with the barrel touching the tube end cap.  I didn't do anything with numbers like the next session where I figured it out.  Took lunch on #4 and no more daylight on #5.  It was 95 degrees Sunday.

The 2nd session on yellow paper was with the barrel/tube band having a shim under it to keep it tight but not allow the barrel and tube cap to touch, I sanded out the stock a little bit just enough to smooth it out and added an alloy .014 shim between the stock and band and I had to make the counterbore on the stock for the screw a little bit deeper.  So far so good.   Still searching for the bell curve on a consistent basis.  Trying to keep the fps under 900 as I just don't need the extra power.
 
Also I just noticed my pump gauge glows in the dark!

[Mark Ward]

The xs60c in pcp is a nice gun but i found my fps ES to be way to high at over 100 fps in a 20 shot string at the speeds i got with mine it should easily give 20 shots at 840 to 850 fps if one can even the string out!

[Mark Ward]

at 1500 psi fill 20 shot string  793 825 830 835 838 845 863 857 865 894 902 895 894 886 869 876 856 858 856 840 so there is no reason why i cannot get around 840 to 850 fps on a 20 shot string or even 830 fps would be great...

[Mark Ward]

pulled the barrel and closed off the transfer port with Sonic-Weld (steel reinforced epoxy putty)with the inside of the port blocked off to keep it flush as to keep it from damaging pellets while loading,Drilled it to .109=7/64's cleaned it off smooth and lubed the orings reinstalled the barrel and started testing the fps with around 1700 psi and this is what i have now .109 BARREL TRANSFER PORT MOD
14.3gr CPHP
813
801
801
837
831
840
843
898
851
851
855
846
852
854
847
848
834
826
824
819
811

JSB HEAVY DIABOLO 18.13GR
721
717
729
736
737
743
759
752
775
771
778
778
790
784
781
774
781
787
775
770
760
744
747
725
722
will continue to tune for a better shot string but it is an improvement from the 100+ fps ES i had before.
 (UPDATE) I adjusted the hammer spring in all the way and shot the JSB 18.1gr over my chrony and here is the results  15 shots
765 805 805 811 817 818 810 799 798 798 798 789 776 776 760 better but still not what i want.

[Mark Ward]

not good enough so i closed the barrel transfer port to 0.09375  will test it and go from there.

[ScarletFire186304]

A good polishing of the hammer, sear, bolt, and  some light lube will go a long way.

i know this a stupid question and may not be the proper venue but how/where does someone learn to do that?

really, i would love to know where to look to find this info if someone would point me in the proper direction.

if a PM is in order, let me know. it would be great to learn about these triggers

thanks , (as always)   

bob

[rsterne]

Mark, it would help if you could measure the pressure at the end of the shot string.... You can usually tell by listening for the "click" when the check valve opens and the gauge slows down on the tank (or pump) you are filling from....

Bob

[Mark Ward]

The best i can tell it usually ranges around 800 psi after i shoot a string.Here is some shots this morning after reducing the  transfer port to .09 using cphp 14.3gr and backing the hammer spring back 1/2 round from flush with the nut,822 829 839 845 844 856 863 865 867 868 850 853 853 852 848 847 833 836 827 821 also pulled the trigger and removed one turn off the L shaped spring,reformed it to fit,smoothed the contacting surfaces and lubed with plumers silicone grease,much smoother and lighter pull.Refilled the gun and shot some 30 yard targets instead of 40 because of the wind blowing shot 5 shot groups.

[rsterne]

Nice string, 20 shots within 4.4% ES... I tried a 0.104" barrel port and obviously didn't go quite far enough.... well done !!! .... If you're getting to use nearly half the fill pressure in your string you're doing great !!!

Bob

[Mark Ward]

Thanks Bob,I wish i could get a tighter ES that would be sweet,i knew the gun should get 20 good shots from the fps i was getting on 20 shots just needed to bring that huge curve down.I almost stopped trying but i am glad now i didn't.It should be a sweet Squirrel & Rabbit killer.

[SnoValley]

Well as usual I'm late to the party. I ordered a first gen .177 from Mike yesterday and have been reading the threads trying to get up to speed.
Seem like most tuning info is related to the .22cal. Is anyone tuning the .177?
It seems the exhaust port is sized to work well (maybe too big) for .22, is the valve exhaust port on the .177 guns the same size? Can anyone verify?
If so it probably will need to be reduced to get the most consistent ES from a .177...Correct???
Any insights or a point in the right direction would be appreciated.
Any thoughts Bob?

Thanks
David

[rsterne]

No idea on the .177, but my guess would be the receiver and valve are the same, but the barrel port is smaller....

Bob