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S200 MK3 .22


lewis11
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Hi all,

I have an AirArms S200 MK3 in .22 it is extremely accurate at around 35 yards but when you move to either longer range (40 yds) or shorter range (20-25 yds) it becomes completely inaccurate. The scope is a Nikko Stirling Mount master 4x12x40. Also, when it is refilled with gas the zero changes and it sames powerless until you do about 10 shots with it? How much do you fill yours up (if you have one!)?

Thanks in advance

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Power will change with a non regulated pcp , thats why people refer to a "sweet spot " which is when the pressure is such that you will get the most amount of shots that are consistent with each other.

 

When you say its not accurate at more or less than 35 yards are you allowing for the pellet drop at these distances , 22 is quite loopy so should be a case of knowing your aim points !

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Hi Lewis, hopefully all will be solved easily!

I don't know how well you know the S200 so I'll start from scratch, sorry if it's stuff you know!

The S200 is normally unregulated so it has a sweetspot, that means that somewhere in the fill it will have a number of shots that are consistent in power, most S200s will start the sweetspot at around 165/170 bar, anything higher than that will be wasted and low powered until the cylinder pressure drops to the optimum level.

I would guess that you're filling to between 180 and 200 bar?

If you have access to a chrono I suggest filling to about 175 bar and then shoot down to 100 bar and record all the velocities, work out where the most consistent 40 shots are in that group, you can then work out the optimum fill pressure and only fill to that in the future.

Loss of accuracy at longer range may be down to pellet choice, mine loves AA Fields and will group within an inch at 50 yards when I do my bit.

Hope that helps,

Regards

Tim

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Power will change with a non regulated pcp , thats why people refer to a "sweet spot " which is when the pressure is such that you will get the most amount of shots that are consistent with each other.

 

When you say its not accurate at more or less than 35 yards are you allowing for the pellet drop at these distances , 22 is quite loopy so should be a case of knowing your aim points !

Hi,

I've been target shooting with the s200 for nearly 5 years, and live quarry shooting for about 4. The air rifle is used everyday, targets or live things. I've never had the problem before.

Thanks for your help regarding the sweet spot

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Hi Lewis, hopefully all will be solved easily!

I don't know how well you know the S200 so I'll start from scratch, sorry if it's stuff you know!

The S200 is normally unregulated so it has a sweetspot, that means that somewhere in the fill it will have a number of shots that are consistent in power, most S200s will start the sweetspot at around 165/170 bar, anything higher than that will be wasted and low powered until the cylinder pressure drops to the optimum level.

I would guess that you're filling to between 180 and 200 bar?

If you have access to a chrono I suggest filling to about 175 bar and then shoot down to 100 bar and record all the velocities, work out where the most consistent 40 shots are in that group, you can then work out the optimum fill pressure and only fill to that in the future.

Loss of accuracy at longer range may be down to pellet choice, mine loves AA Fields and will group within an inch at 50 yards when I do my bit.

Hope that helps,

Regards

Tim

Hi Tim, yes had it for 5 ish years. been filling it to 200 as that's what the RFD told us to do, I will try filling it to 170/180 tonight before i do my zero check for rabbit shooting. I am also using the air arms field pellets, Maybe it's down to me because I've suddenly gone back to using it as its come back from having the trigger repaired.

Thanks for your help and I'll let you know how i get on

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I have a Logun pro it has on the side of it fill to 200 Bar. What a load of B/S. :whistling:

I filled it to 200 Bar and run it over my chrono i was gob smacked. :sick:

At 200 bar = 6.5 ftlb. :w00t:

" 190 bar = 7.4 ftlb. :w00t:

" 180 bar = 9.3 ftlb.

" 170 bar = 10.8 ftlb

" 160 bar = 11.5 ftlb.

" 150 bar = 11.7 ftlb.

" 140 bar = 11.8 ftlb.

" 130 bar = 11.7 ftlb.

" 120 bar = 11.5 ftlb.

" 110 bar = 11.2 ftlb.

" 100 bar = 10.8 ftlb.

" 90 bar = 10.5 ftlb.

" 80 bar = 10.1 ftlb.

" 70 bar = 9.2 ftlb.

" 60 bar = 7.7 ftlb.

So i only fill it to 170 Bar and get about 90 full power shots down to 90 Bar. :good:

I have 7 PCPs only one is Regulated.

The other 6 have a power curves and drop in power if filled to 200 Bar. :yes:

It`s not a problem you just need to know where the sweetspot is for Consistency.

The drop in power will affect accuracy and can give you pellet Wobble. :yes:

It just been worked on (trigger) he might have had your scope off.

I would check the scope screws and the scope mount screws.

I would fill it to 170 Bar. And Clean the Barrel. Check the Scope. And try it. :good:

 

Good Luck.

 

Russ.

Edited by NIGHT SEARCHER
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I have a Logun pro it has on the side of it fill to 200 Bar. What a load of B/S. :whistling:

I filled it to 200 Bar and run it over my chrono i was gob smacked. :sick:

At 200 bar = 6.5 ftlb. :w00t:

" 190 bar = 7.4 ftlb. :w00t:

" 180 bar = 9.3 ftlb.

" 170 bar = 10.8 ftlb

" 160 bar = 11.5 ftlb.

" 150 bar = 11.7 ftlb.

" 140 bar = 11.8 ftlb.

" 130 bar = 11.7 ftlb.

" 120 bar = 11.5 ftlb.

" 110 bar = 11.2 ftlb.

" 100 bar = 10.8 ftlb.

" 90 bar = 10.5 ftlb.

" 80 bar = 10.1 ftlb.

" 70 bar = 9.2 ftlb.

" 60 bar = 7.7 ftlb.

So i only fill it to 170 Bar and get about 90 full power shots down to 90 Bar. :good:

I have 7 PCPs 1 is Regulated. The other 6 have a power curves and drop in power if filled to 200 Bar. :yes:

The drop in power will affect accuracy and can give you pellet Wobble. :yes:

It just been worked on (trigger) he might have had your scope off.

I would check the scope screws and the scope mount screws.

I would fill it to 170 Bar. And Clean the Barrel. Check the Scope. And try it. :good:

 

Good Luck.

 

Russ.

 

There's something else a lot of people don't realise, a regulated gun usually uses more air as well, my S200 uses 1.44 bar per shot, a regulated model uses 1.67 bar per shot and you have to fill 30 bar higher to get the extra shots, that takes some doing with a pump!

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Yes they do, carbine length has less than classic, .22 has more than .177.

If you're seriously considering a change it would be worth contacting "bgaltd" on the Air Arms Owners Club, or google Bond Gun Accessories, based in Somerset, he is Mr AA parts and guns + all sorts of other goodies!

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I find it a little unusual that you have been using this gun so often, and for so long, that you have never solved the initial power loss problem before-it is well documented on hundreds of articles concerning non regged PCP guns. I am also confused as to how a gun can be accurate at one distance and inaccurate 5 yards either side? - surely to be accurate at , say, 30 yards-the pellet must follow an equally true path to reach that point? ? (unless you are using radar guided pellets) :whistling:

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Hi all,

I have an AirArms S200 MK3 in .22 it is extremely accurate at around 35 yards but when you move to either longer range (40 yds) or shorter range (20-25 yds) it becomes completely inaccurate. The scope is a Nikko Stirling Mount master 4x12x40. Also, when it is refilled with gas the zero changes and it sames powerless until you do about 10 shots with it? How much do you fill yours up (if you have one!)?

Thanks in advance

 

Help me understand how a pellet is completely inaccurate at 20-25 yards, then miraculously gains accuracy at 35 yards and goes off again at 40 yards!

 

I have never heard of a magic pellet that automatically corrects inaccuracy in this way!

 

Fill pressure will not cause this!

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I find it a little unusual that you have been using this gun so often, and for so long, that you have never solved the initial power loss problem before-it is well documented on hundreds of articles concerning non regged PCP guns. I am also confused as to how a gun can be accurate at one distance and inaccurate 5 yards either side? - surely to be accurate at , say, 30 yards-the pellet must follow an equally true path to reach that point? ? (unless you are using radar guided pellets) :whistling:

 

 

 

Help me understand how a pellet is completely inaccurate at 20-25 yards, then miraculously gains accuracy at 35 yards and goes off again at 40 yards!

 

I have never heard of a magic pellet that automatically corrects inaccuracy in this way!

 

Fill pressure will not cause this!

The accuracy at different ranges is probably because the scope is zeroed at different range, although I may not have worded the original post very well my main point was the power varying for the first 10 or so shots

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If you are in a competition environment then I would suggest that you borrow a chrono and determine the best fill pressure to give you the most consistent velocity shots-and note how many shots are within an acceptable FPS range. Lets say that you get 30 shots between 600 and 650 fps at a fill pressure of 170 bar. With this information you can make batches of 30 pellets and charge the gun to 170 bar before you shoot knowing that when the 30 are gone you need to recharge your gun. Hope this helps and apologies if my first reply seemed to question your competence.

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The accuracy at different ranges is probably because the scope is zeroed at different range, although I may not have worded the original post very well my main point was the power varying for the first 10 or so shots

 

Accuracy is about repeatability/grouping, that has nothing to do with any distance the scope may be zeroed at, if it doesn't group at 25 yards it isn't going to miraculously group at 35 yards and then not group at 40 yards.

 

If it isn't accurate at 25 yards it is going to be worse every step further out you go!

 

Are you saying for the first few shots you tried it at 25 yards the power was up and down, then, when you tried it at 35 yard the power was constant so it worked, and then when you moved to 40 yards the power was all over the shop again?

 

I simply don't follow your comments, that is nothing to do with distance accuracy!

Edited by Dekers
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