HOW MANY 177 SHOOTERS DO WE HAVE ON TAG
I have looked all over and have found next to nothing on .177 air force data,
I have set my 22 condor up for 800 fps with 14 grain pellets for 20 foot pounds for field target power, and was thinking about getting a 24” barrel in 177 and doing the same thing , but i cant find any reading on the air force for 177 , and like zero groups and such.
i was playing on line with this http://www.airguns.net/trajectory.php
trajectory calculator and it looks like a 10 grain 177 at 925 fps for just under 20 foot pounds of energy ,is – 1.69 at 10 yards ,zero at 35 yards, highest point in trajectory is the zero at 35 yards down – 1.26 at 55 yards, so a (((1.69” trajectory curve)))
14 grain 22 at 800 fps for just under 20 foot pounds of energy is -1.18 at 10 ,zero at 18,highest point in trajectory is +.97 at 35 yards , then down – 1.12 at 55 yards.so a (((2.15 ” trajectory curve)))
not a whole lot of difference, this is figured for the zero to equal out the trajectory with the 3.2 ” bore to scope center on the condor
Just wonder if it would be of any benifit, the 177 would probably use less air, don’t know , just trying to figure out if it would be worth fooling around with.
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True,
but a .22 pellet travelling at 600 fps gives similar muzzle energy as a .177 travelling at 780 fps, pellet weight variable of course.
All im saying is you will use more air to propell the .177 by comparison so your shot count will be down. Over here we regard muzzle energy as a better indication of pellet performance than the speed of the projectile.
Powderburner if you want to go after your own data, I just posted a really affordable 24″ .177 barrel in the for sale section…….. :4:
that doesn’t go alone with every springer in existence, you get more fps with 177 than identical spring gun in 22
the 1 odd factor is the valve return spring, it is so much heavier than the 22,valve duration is next to nil, that and my high fills likely explain the flat curve(incase anybody wanted to say anything…no i didnt consider it to be on the curve, i had just got the gun and was shooting gobs of shots from 3100 to 2700)
here is a 177 example, this string is starting near peak ,doesn’t say what the TH is, and PW is said to be low, but a 10 grain pellet should be in the low 900’s at around 1800 psi or so
quote
CPH 10.5 .177 pellets . P.W. on low 1500 PSI fill . 120 shot count strings of 20 shots . End PSI 600 .
String 1 – 882 , 875 , 877 , 877 , 873 , 872 , 865 , 864 , 861 , 855 , 854 , 853 , 849 , 848 , 847 , 843 , 836 , 837 , 837 , 830 , average 857 fps
String 2 – 829 , 826 , 824 , 821 , 819 , 820 , 809 , 809 , 813 , 802 , 802 , 800 , 799 , 796 , 794 , 791 , 791 , 788 , 783 , 779 , average 805 fps
String 3 – 771 , 771 , 768 , 767 , 768 , 759 , 755 , 757 , 754 , 752 , 750 , 748 , 745 , 744 , 738 , 737 , 737 , 732 , 731 , 726 , average 751 fps
String 4 – 722 , 723 , 718 , 714 , 712 , 710 , 706 , 705 , 698 , 700 , 698 , 694 , 690 , 690 , 686 , 686 , 684 , 680 , 676 , 675 , average 698 fps
String 5 – 672 , 670 , 666 , 664 , 658 , 657 , 658 , 654 , 653 , 648 , 646 , 643 , 642 , 637 , 634 , 635 , 632 , 631 , 625 , 623 , average 647 fps
String 6 – 618 , 620 , 616 , 614 , 609 , 607 , 606 , 603 , 598 , 599 , 592 , 594 , 587 , 586 , 582 , 579 , 578 , 574 , 573 , 570 , average 595 fps
The average of the first 40 shots 831 fps , first 60 shots 804 fps , frist 80 shots 778 fps , first 100 shots 752 fps , average of 120 726 fps . Average air usage 7.5 psi per shot . Total fills off a 80 cf . tank up to 40 .
whats your point these strings show a base velocity figure
if the top strings were 3000 fill , they were pretty much all heading to a higher fps, and i know the last string was heading to a higher fps
exception being the 7th string on top it looks like it might be perfectly centered in the string , so 3000 fill .075 TH, 6-8 PW 10 grian pellet with a talon valve
i thinik the talon valve being more restrictive took higher pressure to get a given velocity figure, maybe ?
Old valve circa 2006 (two holes in brass insert below tophat).
TH 0.065″
PW 0/0
846
865
888
PW 4/8
1095
1095
1086
Newer valve circa 2008 (two slots in brass insert below tophat).
TH 0.07″
PW 4/8
733
772
753
PW 6/8
950
863
954
955
PW 10/8
1091
1093
TH 0.075″
PW 4/8
656
678
669
PW 6/8
851
824
845
908
918
737
866
PW 10/8
1088
1090
TH 0.080″
PW 4/8
788
772
PW 6/8
885
909
941
967
TSS, 18″ barrel, 10.5 grain pellets.
Old valve circa 2006 (two holes in brass insert below tophat).
Start fill 3000, end 2700, 20 shots, one error.
TH 0.061″
PW 0/12
808
err
839
889
925
880
961
930
962
923
955
949
985
970
986
960
931
986
964
967
Bingo. Tagged. Thanks.
Ok, so lets take my 24″ 22 condor right now, its running 700 fps, with 14 grain pellets, if i drop a 24″ 177 on it, your saying my fps would go down with .177 10 grain pellets.
that doesn’t go alone with every springer in existence, you get more fps with 177 than identical spring gun in 22
so you were running the gun pretty much wide open with 10 grain pellets, did you ever get a velocity, i would think that the pellets would have peaked at a lower tank psi than 2700
washer- both. it raised the spring off of the retainer an was maybe .5mm smaller in dia.
given the higher pressures, i shot a long flat curve and they likely didnt peak until lower than 2.7k
Look at any information on shot count for pcp air rifles and you will see that for the same bottle and charge you will get LESS shots with a .177 than a .22. A good reference for this is the Daystate UK site which gives you expected shots per fill on each of their top quality rifles at UK (low) power and at export power.
This is because the .22 uses air more efficiently, and the .177 has comparatively more resistance to overcome to move the pellet. (Something like that)
Fitting a .22 barrel to a gun set up with a .177 barrel will give you higher muzzle energy, doing the opposite, ie a .177 barrel onto an ex .22 will give lower energy. This I know, I’ve done it.
so were you using the washer for a air restriction or a spacer to add more spring tension
so you were running the gun pretty much wide open with 10 grain pellets, did you ever get a velocity, i would think that the pellets would have peaked at a lower tank psi than 2700
well, im stuck with co2 at the moment, but when i was running that setup(hpa): 177 hi flow valve, stong return spring, between the spring and retainer was a nylon washer bored out to the id of the spring and od turned down to the id of the valve body. all porting and polishing as usual.
24 inch stock barrel, fill to 3100 psi, pw maxed out. th at .110. ending pressure 2700 psi, after 40 shots with cph/skenco ultra shock. pw backed off to 2 or 3, 3100 to 2700 yielded about the same velocities with cphp. never counted that many shots but id guess at least 60-70. oem spring and condor hammer/weight. did i forget anything?
m shot , that was his way of saying that any one that know’s the airforce would say pretty close to what you said. 🙂 😉
i think i can turn down, tune down the condor to work with the 177 using the oring and low fill pressures.
just trying to see if i want to mess around with it or not, i should have bought snyops 177 24″ barrel is what i should have done,
how are you shooting the 177 , set up etc.
what the fuck is that supposed to mean?
thanks synops do you remember fill pressure on the first bunch of strings,
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WM , yes i oght to. 😆