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Reply to topic  [ 9 posts ] 
 erratic shot string. Please help. HW100 41J .22 FAC 
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NeuWOCer

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Unread post erratic shot string. Please help. HW100 41J .22 FAC
Here is the shot string


891
891
888
896
897
895
895
898
896
894
898
892
901
914
897
896
911
912
895
892
897
897
891
890
887
880 Off Reg

Only 3 shots in this string ruin the game. These are 914, 911 and 912.

Pellets used JSB 18 grain. FAC .22 gun 24" barrel. Regulator set at 135 bar as per factory setting.

I serviced the gun and replaced all O rings but 3 shots in a complete string ruin accuracy at 50 50 yards.

Any help please.


Wed Aug 09, 2017 4:23 am
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InterWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
You should be happy with that.
Its probably the pellets. To get the true reading you have to weigh and size your pellets. Nothing wrong with your gun. enjoy it.

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HW100S FSB 177 BSA Barrel FAC
HW100T 22 shrouded BSA Barrel FAC
Blue laminated HW 97K 177 spring kit from Tony Wall


Fri Aug 11, 2017 10:51 am
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UnterWOCer
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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
yes nice string

its the pellets,nothing wrong with your rifle.

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Sat Aug 12, 2017 11:35 pm
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OberWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
you are suffering from a mild (i hope) case of chronoitis. that shot string is fine. if its grouping off a rest ok then forget the chrono until it will not group. you will not see those discrepancies on paper. pete


Sun Aug 13, 2017 5:09 pm
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NeuWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
Hi whats the accuracy like at 50yds with 16 & 18gn jsbs. String looks good to me.


Thu Aug 17, 2017 7:02 pm
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VunderWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
stillair1 wrote:
Hi whats the accuracy like at 50yds with 16 & 18gn jsbs. String looks good to me.


must be sh*t
has it ever groupped?
:lol:

i cant believe you have 140 marked on the cylinder green/yellow.

I am not even sure if the 30cm karabine need more hammering. lower it back to 120 if you have not deformed your bellevilles already.


it is a myth that you require single digit fps shot to shot variation. i have a .177 and it is literrally pellet on pellet I mean 5mm group at 25m with up to 30fps variation.

remember also the pellets vary in weight by 5%

i would fit a bsa barrel from a bsa scorpion. a little machining and off you go. Also a bit shorter one so you dont look like a man with a mop


Thu Aug 17, 2017 8:45 pm
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NeuWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
These 41J HW100 .22 come from factory set at 135 bar reg pressure. I have checked many. So there is no tempering with that area.
In this gun we have installed LW 24" barrel to improve accuracy.

It is accurate but still at 75 yards the inconsistent fps spoils the group. There is no issue up to 40 yards.

We have weighed the pellets.

We take full string from 200 bars to 110 bars. After 110 bars, the fps start dropping.

I understand that as HW100 is a semi regulated gun, up to 135 bars, it remain on reg and after 135 bars to 110 bars, it gives consistency as unregulated guns give.


Thank you.

Any idea to improve it?


Fri Aug 18, 2017 5:26 am
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NeuWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
Lower your regulator to 120 bar and adjust HST to get around 840 FPS with a 24" barrel.

FPS deviation will go down and shot count will go up.


Fri Aug 18, 2017 6:21 pm
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VunderWOCer

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Unread post Re: erratic shot string. Please help. HW100 41J .22 FAC
if fps start dropping only under 110 then obviously the reg needs to be set towards that end man.
:bang:

the longer the barrel the lower the reg needs to be set to.


Fri Aug 18, 2017 7:09 pm
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