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Huntsman clasic 177 FAC chrony results

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Huntsman clasic 177 FAC chrony results

Postby Anirudh65 » 13 Sep 2016, 14:26

Results using 10.65 gr H&N baracuda match ammo 177 in my FAC huntsman classic -30 string shot-1003,993.1,986.3,1000,982.6,978.1,973.3,964.3,966.6,961.3,956.3,952,960.7,944.7,942.2,931.8,925.5,914.8,899.3,906.8,900.9,890.4,887.5,880.7,862.2,857.5,843.3,832.7,834.9,814.7 feet per second-total spread 188 fps-max energy abt 24 ftlbs. Similarily results using 7.9 grain CP 177 in my huntsman classic 177 FAC-30 shot string--1048 fps,1044,1042,1037,1031,1021,1025,1022,1022,1012,1007,1001,1001,988.6,985,4,980,976.6,966,956.2,952.9,948.7,943.3,936.8,929,916.5,905.9,899 fps-commenced at 200 bar finished at 90 bar for both pellets ,both noted on the hills pump manometer.Are these figures ok
Anirudh65
 
Posts: 20
Joined: 11 Jan 2016, 01:44
Location: INDIA

Re: Huntsman clasic 177 FAC chrony results

Postby Jking » 14 Sep 2016, 13:53

Anirudh65, I don't know a lot about the ideal speeds for 177cal but most 22 and 25 shoot the diabolo shaped pellets the best around 870-900. Just looking at your numbers the string velocities are falling from shot one on both. What most shooters prefer is an bell curve look, where the velocities start lower, for example in your first string at maybe the mid 900's, 950 or so and then climb to your peak of 1000fps and then starts a steady decline back to 950.

What would fix your current strings would be to increase your beginning fill pressure to say 220-230 bar. This added pressure will make it harder for the hammer to crack the valve open resulting in a lower velocity than the 1003fps that's in your first string. It could very well make that first shot 900-950. So then you get more shots before it peaks with the remaining shots after the peak. You can also stop shooting before it reaches 90bar and that would keep you extreme spread from being to wide.

If you want to keep a fill pressure of 200bar and have a bell curve the hammer energy via the spring or stroke can be altered (at least on mine the stroke can be changed). What you would want to do is shorten the stroke or weaken the spring tension. This just makes it harder to crack the valve with the new hammer energy which will again result in a new lower starting velocity.

I would try the simplest fix and fill to 220 or 230 and shoot another sting, watch your starting velocities and see if they don't climb, peak out and then start a decline. Stop shooting when your at the starting velocity and see what your guns gauge is at. That would give you a good idea of when to stop from now on.
Hope this helps
jimmy
AA S510 Carbine Huma Regged
Daystate Regal 30FPE
Vulcan Tactical 25cal SW 6-24X56 Mil
FX500 Hawke SW 6-14X56
Jking
 
Posts: 158
Joined: 08 Aug 2014, 19:43
Location: Hobbs, New Mexico

Re: Huntsman clasic 177 FAC chrony results

Postby Anirudh65 » 14 Sep 2016, 14:03

Filling beyong 200 bars takes an effort-will try-i can do it but my hills mk 3 pump starts struggling
Anirudh65
 
Posts: 20
Joined: 11 Jan 2016, 01:44
Location: INDIA

Re: Huntsman clasic 177 FAC chrony results

Postby Jking » 15 Sep 2016, 13:19

You might shoot for 210-220. This is why I use 4500# SCBA's. Actually have never tried a pump and hope to keep it that way. LOL
jk
AA S510 Carbine Huma Regged
Daystate Regal 30FPE
Vulcan Tactical 25cal SW 6-24X56 Mil
FX500 Hawke SW 6-14X56
Jking
 
Posts: 158
Joined: 08 Aug 2014, 19:43
Location: Hobbs, New Mexico

Re: Huntsman clasic 177 FAC chrony results

Postby Anirudh65 » 21 Jan 2017, 07:09

Results JSB 13.43 gr monster pellet is 915.5,921.9,911.3,905.4,896,896.5,892.3,891.2,884.4,887.2 fps string shot from 220 bars.avrgae FPE 24.16
Anirudh65
 
Posts: 20
Joined: 11 Jan 2016, 01:44
Location: INDIA


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