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S510 XS .22 velocity change over 5 shots indoors
Posted: Sat Jun 25, 2022 7:27 pm
by J Michel
I have a S510 XS Stealth Carbine. My concern is when shooting indoors on #4 setting at 210 bar, more or less, I can get 4 velocity readings at 888 fps and one at 875. Can be in the middle or at the end. Little over 2000 shots fired total.
The problem is I do not know when the velocity might change. Sometimes it shoots the same velocity over 5 shots.
Pellets used are JSB 18.13 gn weighed pellets. Can it be a correctable problem?
Thanks
JM
Re: S510 XS .22 velocity change over 5 shots indoors
Posted: Sun Jun 26, 2022 2:15 pm
by Zed.
J Michel wrote: ↑Sat Jun 25, 2022 7:27 pm
get 4 velocity readings at 888 fps and one at 875
does 13 fps really alter the poi? I appreciate you're running at higher power (~30 - 31ft/lbs)
before you blame the rifle / valving are the pellets the same weight?
Rich.
Re: S510 XS .22 velocity change over 5 shots indoors
Posted: Sun Jun 26, 2022 3:35 pm
by J Michel
Rich, The 18.13 JSB pellets are weighed to .xx grains on a Satorius Scale. The sorted one weight pellets are sorted by head size with a Pellet Gage and the skirts are uniformed to same diameter using a TR Robb sizer.
I only shoot between 250 bar and 155 bar usually around 200 bar all on level 4.
The shots all go into the same hole (just some are bigger) but I am working on trying to minimize the 5 shot groups to under <0.030" .
I have gotten as low as .017" the other day but everything was perfect (.224" +.017"). The correct size pellet head, skirt, air pressures, etc. All testing done in my basement range. All the FPS velocities are within a small range so I do not think I have an o-ring problem but everyonce in a while I get a low velocity that I cannot predict so I can hold appropiately. Thanks for your input.
JM