S410

[mole catcher 1]

 

In my 12ftlb pcp,any of the heavier pellets will produce higher ftlbs readings,but in my springers the reverse is true.

Deker,as you say a .22 pellet with a muzzle reading of 780FPS would be 27.02 ftlbs.

 

if you re-read my post i said that a .22 pellet weighing 18-20grains traveling at 780fps gives you about 26ftlbs. this is the point that most experts, not me believe to be the cross over point of the formular of weight x speed = power

 

i know full well a .22 pellet traveling at 780 fps would be giving 26-30 ftlbs as bill88 has proved.

 

 

also through my own experiance has shown my sub 12ftlb falcon using aa filds gives more ftlb over the cron than it does when i use bisley magnums, unlike your rifle althogh it is the same make and model.

 

does this meen that other things have to be taken into consideration such as condition of barrel, age of gun, the acuraccy of the tooling at the workshops of the guns makers?

[Deker 3,478]

 

In my 12ftlb pcp,any of the heavier pellets will produce higher ftlbs readings,but in my springers the reverse is true.

Deker,as you say a .22 pellet with a muzzle reading of 780FPS would be 27.02 ftlbs.

 

 

if you re-read my post i said that a .22 pellet weighing 18-20grains traveling at 780fps gives you about 26ftlbs. this is the point that most experts, not me believe to be the cross over point of the formular of weight x speed = power

 

i know full well a .22 pellet traveling at 780 fps would be giving 26-30 ftlbs as bill88 has proved.

 

 

also through my own experiance has shown my sub 12ftlb falcon using aa filds gives more ftlb over the cron than it does when i use bisley magnums, unlike your rifle althogh it is the same make and model.

 

does this meen that other things have to be taken into consideration such as condition of barrel, age of gun, the acuraccy of the tooling at the workshops of the guns makers?

 

Don't understand that, Magnums always gave me more power than the Field sub 12 ft lb. in my FN19RS...and still do at 26ft lb!

 

AND I have no Idea why Springers would not perform the same but according to bill88 the opposite is true...so who can explain that one?

[mole catcher 1]

i think theres one or two gun smiths on this site or folk from an engineering background, maybe thay can shed some light on the subject.

 

must be more than simply fps and pellet weight?

 

anyone?

[ironman andy 0]

Ive altered the pellet weight and you are correct.. .. the gun was firing over the required legal limmit..it has now been altered and is back to firing at 11.6 ftlb..

Cheer's

Millet

 

No probs Millet .

 

Mole catcher is correct in saying that certain springers and certain pcp's react opposite to pellet weights, ie a heavier pellet may push a springer over but the same weight pellet may make a pcp lower powered (haven't worked out just why, yet ).

 

On answer to the actual thread question, fill gun with air, check the gun over a crono (average fps over a dozen or so shots), turn screw 1/2 turn (any direction) re-check readings over crono with the same pellets. If readings are higher then obviosly the way you turned the screw increases velocity.

If no change in velocity give screw another tweak and check (always count turns of screw and direction and write this down, it is easy to forget when you are testing, (or when someone tells you tea is ready ) then you can always put it back to exactly where it was when you started if things go pear shaped!!).

Remember to keep the gun filled during testing to try and keep the variables to a minimum.

 

Andy