I want to shoot things!

[Finless]

My BB wants a cylinder from which to fill an air rifle.

1. Is a 3 ltr any use or should he go for 10 ltr?

2. Are the test requirements any different for this use? Presumable the only place to get them filled is going to be dive oriented?

Anything else I need to ask about?

[Paddy Diver]

3lt will be fine but you wont get the same amount of fills to the gun as with a 10lt.

Test requirements are the same as per usual scuba cylinders.

You may need a connection to go from the cylinder on the gun to the connection on the scuba cylinder.

http://www.deepblueshooting.co.uk/category.aspx?id=1255

check out DeepBlueShooting and have a look, in pictular the two charging systems at the bottom left on the first page for the above link.

Ian

[Tankbanger]

Or perhaps a seven litre. He will need a filling whip and gauge as well.

[Dive now work never]

For it to be any use you'll need a 300 bar, normally a seven or a ten.

[Finless]

If I understood Colinicky correctly:-

1. Buy a scuba cylinder and you are supposed to get it tested as per the normal schedule.

2. When it passes it may be marked for surface use only and move of to a 5 year test cycle.

3. Also, at the time of a test a new valve will need to be fitted which, obviously, means it is not compatible with scuba gear.

My apols to Colinicky if I have recited this incorrectly.

[nigelH]

300bar?

Theoben quote 200 bar and 45 shots before the pressure is out of range.
Over fill and the velocity tends to go down (the poppet won't stay open as long) and the spread of shots goes up wildly.

The cylinders aren't rated for use under water so the testing is less strenuous. I forget the details as I don't have any but I think it's about double our intervals.

Can I spam you with a chronoscope advert?
You don't know what a chronoscope is?
I won't bother then...

[Tankbanger]

I would check out the surface use only bit, not sure on that. 300 bar is a good call.

[Tankbanger]

Seems like a good call from Nigel re testing check out this website, so he may well be spot on re the 300 bar bit too.

C & R Testing

[Graham Smith]

You don't want your gun bottle / reservoir at 300 bar as yes, the velocity drops considerably, but you certainly get a lot more fills decanting from a 300 bar tank and so less trips to get it filled. However, balance this with the additional cost of a 300 bar tank....

If going for 200 bar then the bigger the better as otherwise you soon start to run out of pressure to fill the guns bottle to its WP of 200 bar.

If you get a regulated gun then the shots per charge increase substantially (I think Theoben suggest you get 6500 shots per fill of a 15 ltr - that will keep anyone quite for a while)