pellets and spring guns

[cometa300s 20]

i was just wondering if the pellet weight will play on the spring causing it to lose power im shooting aa diablo

pellets

 

thanks liam

[gilly-93 31]

Dond understand how can a pellet make the spring loose power lol

[cometa300s 20]

just the weight. i was wondering could that play a part on ware and tear as i have had 2 springs put in my cometa in the last year

[scothunter 12,609]

just the weight. i was wondering could that play a part on ware and tear as i have had 2 springs put in my cometa in the last year

 

Get a gas ram fitted mate

[Grim Reaper 1]

just the weight. i was wondering could that play a part on ware and tear as i have had 2 springs put in my cometa in the last year

 

 

I would say it wholly depends on the amount of use you give it mate, more use = more things wearing out. Less use = same things are lasting longer, like?

 

What i mean is, its all relative.

 

HTH mate?

 

 

Regards,

Grim.

[sumo 0]

Hi cometa a light weight pellet will allways produce more power in a springer

than in a precharge

yet a heavy pellet will allways produce more power out of a precharge than a

spring gun I don`t know why this is it just is

aa diablo should give you about the right power to weight ratio in your gun

in 177 in 22 i would go for a light weight pellet such as a bisley lrg or accupell

hope this helps

cheers stu

[forgive my ramberling im a bit p**s*d ]

[Grim Reaper 1]

Hi cometa a light weight pellet will allways produce more power in a springer

than in a precharge

yet a heavy pellet will allways produce more power out of a precharge than a

spring gun I don`t know why this is it just is

aa diablo should give you about the right power to weight ratio in your gun

in 177 in 22 i would go for a light weight pellet such as a bisley lrg or accupell

hope this helps

cheers stu

[forgive my ramberling im a bit p**s*d ]

 

 

I think (though may be wrong) that it is due to how the springer and pcp work, individually, like?

 

As I understand it, it would seem to go something like this:

 

In a springer, once the trigger is pulled, the spring starts to uncoil, and this shoots the piston on it's way up the compression cylinder, which continually compresses the air stored in the cylinder. About 2/3's of the way on the piston's way along the cylinder, the pellet starts to move along the barrel, having now got enough pressure behind it to start it moving . At this stage, the spring is still uncoiling and still piling on pressure on the now moving pellet. When the spring reaches the end of it's journey (near the exhaust port) its compression is ended. But the compressed air is still expanding at this point and so the pellet gets still more pressure behind it, and as the saying goes ' a rolling stone gathers no moss'. Therefore, the pellet leaves the springer's barrel with more power. So, in a springer, the air is always expanding, like.

 

On the other hand, in a pcp, once the trigger is pulled, the top hat valve lets a measured, pre-set amount of air into the exhaust port, which in turn lets this charge of air into the breech, which again in turn instantly sets the pellet in motion on it's journeyup the barrel. Once the measured dose of air is delivered to the pellet, and the pellet starts moving, there is no more expansion to be had from the air because it has been metered out. So whereas the springer has a continual air expansion process, the pcp doesn't have that benefit.

 

I'm sure someone more knowledgable in the subject will be along to either confirm my thoughts, or point out any innaccuracies in them.

 

 

All the best,

Grim.

[Thorburnlad 0]

could pcp's not have a looser barrelling in tha barrell?

 

and a springers be tighter?

causing the pellet to be slightly more restricted

meaning that the full wack of air hits the pellet

when the piston bottoms out?as it has delayed the springers pellet those vital micro seconds

giving it the full force of the

air perfectly on to the back of the pellet without the pellet starting to slide

slowly down the barrell? reducing comprression. the area inside the barell would be smaller due to the pellet struggling to set off,

the compression of air would be more compressed meaning no inconsistency and a greater muzzle velocity

 

 

 

 

 

i dont know just thought i would give it a try lol

and i havent put rum in my tea

[NO TEXT TALK] understand? lol

[Grim Reaper 1]

could pcp's not have a looser barrelling in tha barrell?

and a springers be tighter?

causing the pellet to be slightly more restricted

meaning that the full wack of air hits the pellet

when the piston bottoms out?as it has delayed the springers pellet those vital micro seconds

giving it the full force of the

air perfectly on to the back of the pellet without the pellet starting to slide

slowly down the barrell? reducing comprression. the area inside the barell would be smaller due to the pellet struggling to set off,

the compression of air would be more compressed meaning no inconsistency and a greater muzzle velocity

i dont know just thought i would give it a try lol

and i havent put rum in my tea

[NO TEXT TALK] understand? lol

 

Hi mate,

 

In answer to your question (if i have it right) is that its not so much a case of having one barrel 'looser' or 'tighter' than the other, as such. If you were to look at a springer barrel, and a pcp barrel - both of which, lets say,have a 1 in 12 rifling pitch, this means that a pellet fired out of both would have the same rate of twist. The distances (ie edge to edge, within the barrel) between the lands (raised parts), and the grooves (lowered parts) would obviously be increased with larger calibres, but also bear in mind that each calibre's barrel can also be manufactured so as to have at the fore-end of the barrel a very miniscule (you might say microscopic) degree of being tighter than the original calibre it is intended to fire - this is known as 'choking'.

 

Lets discuss the .177 barrel for a moment. Ok, basically, you have two variants/options of a .177 barrel, they are:

 

Unchoked barrel -This barrel has the characteristic of being the exact same diameter along it's entire length, from the breech, right along to the end of the rifle at the muzzle. The land and groove measurements will remain at a constant diameter.

 

Choked barrel - This barrel will be the same diameters as the barrel above, but the last couple of inches (muzzle end)will be where the barrel is microscopically tighter than the preceeding (breech to start of choke area).

 

If I have read and understood what you mean in your question, what you may call a 'looser' barrel may be the 'unchoked' one i speak of, and the 'tighter' barrel you refer to would seem to be the 'choked' version i speak of . . . . .If that makes sence?

 

 

 

Regards,

Grim.

[T78 4]

i read somewhere years ago that its to do with the way the air is delivered to the pellet..in a pcp its a long "slow"push of air and in a spring its a short hard "jab" of air. if that makes sense? (one of the reasons fac pcp's have longer barrels.to get the most from the long "push" of air) think thats right anyway!

[Thorburnlad 0]

could pcp's not have a looser barrelling in tha barrell?

and a springers be tighter?

causing the pellet to be slightly more restricted

meaning that the full wack of air hits the pellet

when the piston bottoms out?as it has delayed the springers pellet those vital micro seconds

giving it the full force of the

air perfectly on to the back of the pellet without the pellet starting to slide

slowly down the barrell? reducing comprression. the area inside the barell would be smaller due to the pellet struggling to set off,

the compression of air would be more compressed meaning no inconsistency and a greater muzzle velocity

i dont know just thought i would give it a try lol

and i havent put rum in my tea

[NO TEXT TALK] understand? lol

 

Hi mate,

 

In answer to your question (if i have it right) is that its not so much a case of having one barrel 'looser' or 'tighter' than the other, as such. If you were to look at a springer barrel, and a pcp barrel - both of which, lets say,have a 1 in 12 rifling pitch, this means that a pellet fired out of both would have the same rate of twist. The distances (ie edge to edge, within the barrel) between the lands (raised parts), and the grooves (lowered parts) would obviously be increased with larger calibres, but also bear in mind that each calibre's barrel can also be manufactured so as to have at the fore-end of the barrel a very miniscule (you might say microscopic) degree of being tighter than the original calibre it is intended to fire - this is known as 'choking'.

 

Lets discuss the .177 barrel for a moment. Ok, basically, you have two variants/options of a .177 barrel, they are:

 

Unchoked barrel -This barrel has the characteristic of being the exact same diameter along it's entire length, from the breech, right along to the end of the rifle at the muzzle. The land and groove measurements will remain at a constant diameter.

 

Choked barrel - This barrel will be the same diameters as the barrel above, but the last couple of inches (muzzle end)will be where the barrel is microscopically tighter than the preceeding (breech to start of choke area).

 

If I have read and understood what you mean in your question, what you may call a 'looser' barrel may be the 'unchoked' one i speak of, and the 'tighter' barrel you refer to would seem to be the 'choked' version i speak of . . . . .If that makes sence?

 

 

 

Regards,

Grim.

yes grim

 

[Thorburnlad 0]

i read somewhere years ago that its to do with the way the air is delivered to the pellet..in a pcp its a long "slow"push of air and in a spring its a short hard "jab" of air. if that makes sense? (one of the reasons fac pcp's have longer barrels.to get the most from the long "push" of air) think thats right anyway!

 

yes pitindall although i thought it was the oppisite way around ??

with the spring being the long low push of air?

and pcp being the short hard jab

 

 

regards

 

thorburnlad

[Grim Reaper 1]

i read somewhere years ago that its to do with the way the air is delivered to the pellet..in a pcp its a long "slow"push of air and in a spring its a short hard "jab" of air. if that makes sense? (one of the reasons fac pcp's have longer barrels.to get the most from the long "push" of air) think thats right anyway!

 

yes pitindall although i thought it was the oppisite way around ??

with the spring being the long low push of air?

and pcp being the short hard jab

 

 

regards

 

thorburnlad

 

 

Yes, with respect to the output of air from the 2 types of air rifle, the 'slow push' is what the springers do, and the 'quick snap' is what the pcp's do. The pcp rifle's valves work marginally quicker than the spring action, and i believe the pcp's air expansion drops a lmarginally quicker than a springers expansion? I think.

 

 

 

Regards,

Grim.

Edited August 18, 2008 by Grim Reaper

[cometa300s 20]

nice one for these post guys i will prob refair back to them in the future

[Guest hyperion]

its all down to the way the two types of rifle work!

its just a matter of a heavy pellet taking more effort to push up the barrel, just like you or i trying to push a 4x4 rather than a mini!

all thet air building up behind the pellet has to go some where and if it takes more effort to push a heavy pellet it can be forced out around the breech seal or back past the piston its self!, heavy pellets in springers increase lock time (time taken from pullting the trigger to the pellet leaving the barrel) and also more recoil and piston bounce!, though they arrive at the target with more oomph they take longer to get there!

springers are less efficent than pcps so use more air at a lower pressure to get the same result!

any way thats my two pence worth!

id say some thing is very wrong if youve got through two springs in a year!!!, ive had my tx200 for six years and its still got the same spring and is still bang on at 11.5 ft/lbs even though its used every day with a veriety of different pellets!

cheers

hyper