S510 XS .22 velocity change over 5 shots indoors

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J Michel
Posts: 4
Joined: Fri May 07, 2021 2:36 pm

S510 XS .22 velocity change over 5 shots indoors

Sat Jun 25, 2022 7:27 pm

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

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Zed.
Posts: 64
Joined: Sat Aug 31, 2019 10:32 pm
Location: Swansea, WALES. UK (maybe NSW in a few years...)

Re: S510 XS .22 velocity change over 5 shots indoors

Sun Jun 26, 2022 2:15 pm

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.
Bleugh!

it is my firm belief that people who declare they have a 'bigger signature than' someone are trying to make up for something else :lol:

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J Michel
Posts: 4
Joined: Fri May 07, 2021 2:36 pm

Re: S510 XS .22 velocity change over 5 shots indoors

Sun Jun 26, 2022 3:35 pm

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

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