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Air Arms S410 .177 Carbine Shot String

Discussion in 'Airgun Data Center' started by Bob_T, Apr 27, 2021.

Tags:
  1. Bob_T

    Bob_T Engaging Member

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    Location:
    North Wales
    Hi all

    I am sharing some shot string data from my new S410 carbine in .177 using AADF pellets 4.51mm 8.44 grain

    The rifle has had about 250 pellets through it since I bought it new a few months ago. I did the testing earlier today.

    I was interested in finding its sweet spot to ensure I maximise its accuracy for hunting.

    I am using a Hills pump, an LMBR R2A chrono, with 20 cm between the chrono and the end of the moderator.

    I filled the rifle to 170 BAR shown on the Hills pressure gauge. The gauge on the Hills is clear, and has major marks every 10 BAR and minor marks every 5 BAR. I would estimate my reading error to be +- 5 BAR on the gauge.

    I wrote down the pellet velocity in FPS for each shot, and entered the data in Excel - and used Excel for the velocity graph below. I used a statistics package called JASP to summarise the numerical data for the subset of data that I considered to be within the sweet spot. I explain later how I chose the sweet spot shots.

    I stopped the data collection after 64 shots, as it was clear that the velocity was dropping away by that stage.

    I then connected up the Hills pump and pumped until I encountered the first significant resistance to pumping. This occurred at 110 BAR on the Hills gauge. I suspect there is room for error in this method for measuring the pressure in the rifle reservoir, so the actual pressure might well be anywhere between 105 and 120.

    Here is the graphical data for all 64 shots from 170 BAR down to 110 BAR.

    upload_2021-4-27_19-46-21.png

    After looking at the graph, I decided to look at the sequence of shots that had a velocity of 775 FPS of higher, as I thought those shots had velocities that were consistent enough to comprise my rifle's sweet spot.

    Therefore, shot 9 through to and including shot 55 had velocities of 775 or higher. This gives a total number of sweet spot shots of 47. This number seems consistent with other S410 owners experience on this forum. Each shot uses approx 1 BAR of pressure, so I calculate that I should in future pump to 160 BAR as this is where my rifle's sweet spot is likely to start from.

    I examined the 47 sweet spot shots in more detail. First, a graphical summary of the 47 shots.

    upload_2021-4-27_19-56-0.png

    The box plot is symmetrical which suggests that the velocity of the 47 shots is normally distributed around a mean/median/mode of approximately 781 FPS (11.4 ftlbs). About half the velocities are between 777 and 784 FPS.

    More detailed numerical summaries are shown below

    Descriptive Statistics



    Velocity

    Valid

    47

    Missing

    0

    Mean

    780.915

    Median

    781.000

    Mode

    780.000

    Std. Deviation

    3.798

    IQR

    6.500

    Range

    14.000

    Minimum

    774.000

    Maximum

    788.000

    To conclude, I was pleased to see my rifle perform as I had expected. Its sweet spot is from 160 Bar, and I can get 47 precise shots out of it from that fill pressure.

    Thanks for reading. Comments welcome!

    Bob
     
    Last edited: Apr 27, 2021
  2. David M

    David M Donator

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    Location:
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    Hi Bob, your findings seem to relate to my .177 s400 carbine. I conducted my tests though through pellet grouping at 30 yards from 180 bar down to 110 when the POI started to drop. Between 180 bar and around 160, the POI change is hardly noticeable in a hunting scenario at sensible ranges. I find accurate gun pressures by topping up with my tank, the tank's guage climbs rapidly until it reaches the gun pressure then slows right up during a top up....:up:
     
    Bob_T likes this.
  3. Bob_T

    Bob_T Engaging Member

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    Location:
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    Thanks David

    Your POI approach makes loads of sense and sounds more grounded than mine. So I’ll try your method at my 35 yard zero.

    Thanks
     
    David M likes this.

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