Need Help For CO2 Rifle

[chattron]

Hello Guys i need some help on this.I have an Daisy 888 CO2 air rifle and i have fired >50 pellets through it as of now.The problem is that at 10m when i use P10 pellets weighing .65grams there is significant pellet drop.Also the pellet velocity is very less compared to Anshutz 2002 rifle of the state association.The max velocity advertised is 500fps at 4.3ft lb me.I had applied 4T motor oil to the O ring of CO2 cylinder instead of 30 wt ATF fluid(recommended) when installing it in rifle.I have calculated that with 4.3ft lb ME i should get MV of 448ft/s with 9.6 gr pellets that i have but i am not getting the above velocity.I would be grateful if the Gurus can analyze this and suggest some remedial measures.Thanks.

[nagarifle]

hi chattron

one common problem with co2 is that when its low on air the pellets goes all over the place.

so first thing would be to check that the co2 is not low, which i think u already checked.

i do not think that oil would make much difference if any in pellet drop.

with any co2 rifles, if u have pellet drop than first thing to check will be air source from the bottle to the cheamber, as u may have a leak somewhere,

also if the rifle was taken apart not put back pukka, may be a second reason. also check the in side of the barrel for any clogging or blocking.

some time air escapes from the trigger action, ie when the trigger is pulled or the rifle is coked via bolt action, check those area for leaks.

i can not think of any thing else at the moment.

all the best

[mundaire]

A lower than advertised velocity is nothing to worry about. What you should be checking is consistency in velocity from shot to shot using the same pellets.

Ideally you should weigh the pellets to make sure that their weight is as close to each other as possible (Indian pellets are notoriously inconsistent in terms of weight), then charge the rifle with CO2, shoot off 2-3 pellets before you start measuring velocities (the first 2 or so shots on a CO2 airgun are usually off). If there is a wide variation is velocities (using this method), only then should you worry about any defects etc. in the rifle.

Cheers!
Abhijeet

[chattron]

Nagarifle
Thanks for the advice.Will check the rifle for leakage.The problem here is that i have checked the net for stripdown of 888 CO2 rifle but not able to find any link.Could u direct me to any link for stripdown of this rifle or any other similar rifle so that i dont goof up.

Abhijeet
Thanks for the suggestions.I do weigh the pellets before testing.Only problem here is i dont have a chrono to measure velocities.The pellet velocities i have observed are in comparison to anschutz match rifle and my own IHP 35 .22 rifle.These velocities i have assumed are by the clean cuts and depth of penetration in targets by the above 2 rifles vs the Daisy CO2 rifle.Could u suggest me some method by which i could determine the velocities,my brain seems to have stopped working efficiently these days!Awaiting ur replies.Bye.

[nagarifle]

hi chattron

i do not have any links for the strip down.

what i do is that i write down what i took from where and lay it out on line sheet in the order i took things out.

that was in the old days.

now with cameras at hand just take pics as u go along, take each step with pics and lay it down in the sequence as taken out.

unless u have a second rifle of the same type than u can easily compare the part.

hope this helps.

[dev]

Chattron try the www.yellowforum.com and post your query. If it was bulk fill I'd say that you are not getting a full fill. But since you are using cartridges then it should be okay unless the carts are suspect. Be careful with the lube as you can wear out the o-rings very fast with any detergent or petroleum content. Use silicon grease when you can as the oil will blow thru to other parts of the rifle while shooting. Why don't you email daisy? Normally they will send you a diagram. Don't try taking anything apart without a drawing.

Regards,

Dev

[striker]

dev
can the cylinder below can be used for co2 bulk fill like qb series and other sporting co2 rifle which works under bulk fill method
















they are soda stream bottle available for 50 rs exchange of cylinder for use in home soda maker

[dev]

I will answer this with the caveat that you take this to a co2 supplier (industrial gas dealer) to make a filling connect to your rifle. Or you can buy the bulk fill extension for the rifle tube from mac1airgun and also an on /off valve from a paintball shop or even mac1. Then get a knowledgeable chap who normally works with gas to make you an adapter or install the parts that you buy. Then you can run your rifle on bulk. Another thing that you might try is getting a paintball bottle from Indian paintball league and then get the bulk refilling part from the USA (asa to npt valve) and try that out. A good gas guy might also design a desi jugaad from your bottle to your rifle's fill tube. This might work out quite good.

Regards,
Dev

[striker]

Thanks dev
i will start the research on that.can u throw some light\pics to show how u refill ur qb with suitable atapters with specifications

cheers
striker

[art_collector]

Hi anyone interested in Walther CO2 cylinders ...think weight is 12 grams if I heard it rite...just PM me

[striker]

dev
i think it is worth watching for co2 bulk option





cheers
striker

[chattron]

Dev
Thanks for the help.Posted a query on www.targettalk.org.The guys there have adviced me to wait for 500-1000 pellets through rifle n then check for velocity.Also to stretch spring behind firing pin by 2-4mm.Meanwhile i tried some experiments,used a plastic pen body size of .177 pellet length about 3 inches,stuck this in front of muzzle aligned flush with barrel and then fired some shots.The velocity seems to have increased due to increased barrel length but the pellets tumble n hit the target.Can the barrel length be increased in a proper way and what is the ISSF specs for barrel length.Bye.

[mundaire]

Dev
Thanks for the help.Posted a query on www.targettalk.org.The guys there have adviced me to wait for 500-1000 pellets through rifle n then check for velocity.Also to stretch spring behind firing pin by 2-4mm.Meanwhile i tried some experiments,used a plastic pen body size of .177 pellet length about 3 inches,stuck this in front of muzzle aligned flush with barrel and then fired some shots.The velocity seems to have increased due to increased barrel length but the pellets tumble n hit the target.Can the barrel length be increased in a proper way and what is the ISSF specs for barrel length.Bye.

I very much doubt if increasing the barrel length on a CO2 airgun will help increase the velocity. Beyond a certain (optimum) length increasing barrel length would actually lead to a decrease in velocity due to friction! Check out http://www.pyramydair.com/blog/2007/07/ ... ty-in.html for results of an actual experiment...

How long is your barrel anyway?

Cheers!
Abhijeet

[chattron]

Abhijeet

Thanks for the link.For some real experimentation ill have to install a long barrel and then cut it if velocity is less than before.The barrel on my rifle is about 18-19inches.Have tried Finale Match high speed pellets seem to give good grouping from bench rest.Anyways i will post further test findings as i am able to conduct them.Hoping to get chrony in near future but right now have an Izzy stuck in Mumbai customs.Require prayers n good wishes of IFGians.Bye.

[mundaire]

Abhijeet

Thanks for the link.For some real experimentation ill have to install a long barrel and then cut it if velocity is less than before.The barrel on my rifle is about 18-19inches.Have tried Finale Match high speed pellets seem to give good grouping from bench rest.Anyways i will post further test findings as i am able to conduct them.Hoping to get chrony in near future but right now have an Izzy stuck in Mumbai customs.Require prayers n good wishes of IFGians.Bye.

The point I was trying to make was that your existing barrel length is (in all probability) the ideal for your particular model. Your model IS NOT designed for power as it is strictly a 10m target rifle so you will NOT get any/ much increased power output by messing around with the barrel length! For a 10m gun the whole point is accuracy and NOT power/ velocity so concentrate your energies on ensuring CONSISTENT velocities in stead of increasing the velocity. Power can potentially be increased but that will entail other modifications which have nothing to do with barrel length.

Cheers!
Abhijeet