TargetTalk

Does anyone know this?

Thanks,
Scrench

This might do better in the air rifle and smallbore section.

If you can tell me the weight when empty then the weight and pressure and ambient temperature when it is full I can get you pretty close.

I have to ask, why do you want to know?

'Dude

I want to know how many fills my scuba tank will get.

Scrench wrote:I want to know how many fills my scuba tank will get.

It's not quite that simple because the pressure will be different in the two vessels and changes in the scuba bottle as it drops down. I'd be suprised if a 232 bar large tank didn't give you about six months worth of fills, unless you're shooting every day.

Rob.

Rob I seem to recall that the LG 300 as well as the current LG 400 fill to 300 Bar. Filling off a 300 even a 3l one will be fine, giving lots of use, but a 232 will very quickly be mostly working at the bottom end of the fill.

Alan

My Walther LG300 fills to 300 Bar but our club scuba bottle has a 232 Bar capacity. Our other scuba tank is 200 Bar capacity and filling to 200 Bar on my LG-300 still gives me around 285/300+ shots. The 323 bottle a little more.

Walther replied to my email, the cylinder holds 154cc of air.

JSBmatch,
You sound like the guy I want to talk to. My tank is an 80 that I can only get filled up to 3300 psi max. I've run the numbers with AirHogs fill calculator, and it seems that the maximum number of fills I will get out of my tank is if I short-fill the LG's air tank to only 2500 psi or 170 BAR, and refill at 1000 psi where the gauge goes into yellow. I'm hoping to get about 120 shots filled to that level, which according to AH's calculator would give me 35 fills, for 4,200 shots. Does the 120 shots for that amount of fill sound close?

Also, do you know of anyone looking to sell their 300 XT Junior?

Thank You,
Scrench

Yeah, 120 sounds about right, Don't know any 300 XT juniors for sale right now. Check the trade mags and ads.
FWB 700 only gives 260 +/- shots from 200 bar.
If you are and intend to shoot often at quite serious level, it might pay in the long run to buy your own compressor. I know Gehman sell one, there are a couple of other makes. You may have fellow shooters who would also benefit and perhaps jointly fund the purchase.

An ISSF, Air Rifle match is 60 shots plus sighters, say about 70 shots in total, so 120 would be more than enough. Can you get a 200 bar Scuba tank and is there a divers shop who can fill to 200 bar.
The full size Walther air cylinder will fill to 300 bar which will give you over 400 shots, but not many diving shops can fill to that level. I never fill my LG-300 more than 200 Bar and I still get over 300 shots.
I'm sure I haven't answered all your question but hope this helps.
JSB

200 BAR is only 2950 psi. My tank fills to 3300 psi so I could fill the gun to 200 BAR, but, after playing with the numbers on the fill calculator at Airhog's site, this is what you get:

80cf scuba tank filled to 3300 psi. Gun refilled when it drops to 1000 psi (gauge goes into yellow).

Fill gun to 200 BAR (2950psi) - tank gives 12 refills x 300 shots = 3600 total shots per tank.
Fill gun to 170 BAR (2500psi) - tank gives 35 refills x 120 shots = 4200 total shots per tank.

I know it seems counterintuitive to shortfill a gun and come up with more shots, but I learned this trick a long time ago shooting field target, how to make your main supply air tank last longer=less trips to get it filled=less$. It's all about how much headroom you leave in your tank.

I shoot silhouette, and a normal match is 40 shots, usually two a day. Regionals or higher are 60, but when I practice, I shoot about 120 shots at a time, so that was the minimum I was looking for.

Hi
My wife had a LG300 junior for a couple of years and its now one of our club rifles, filled to approx 250 bar it will just sqeak two 60 shot matches with sighters, from the cylinder, but its getting close. We never ran them close to the yellow and usualy refil at 100 bar just to be sure even though they still regulate closish to the yellow.
Walther do still list the Junior although I don't think there are many being made now as the LG 400 can be adjusted down to the same length and weight.
Good shooting
Robin

Robin, could you please check with members of your club to see if anyone would like to sell their LG300 XT Junior?

Thank You!

Scrench
Sorry the simple answer is NO! We are always looking for used ones, Walther still list them so you could buy one new if you wish.

They are very favoured by juniors and particularly small Ladies, my wife now uses a special which is an LG400 action in an LG300 Junior stock and weighted up to close to full weight.

Best of Luck
Robin

Going back to the original intent, the object is to know how many fills per tank.

As Rob said, this is not a trivial problem as the pressure in the tank changes each time you fill.

Now, there were some interesting numbers posted from tinkering on an AirHog website for whatever kind of airgun that was. The comparison of a Walther, Anschutz or FWB to an AirHog anything is limited at best. Those numbers seemed low.

Using my own FWB that fills to 200Bar I made a few assumptions about constant temperature and got to a little computer modeling. I made the assumption I would refill the cylinder at 100Bar and consider my scuba tank empty at 125Bar. Next, in the middle of my gauge I get about 3 shots per bar in the cylinder around 150Bar pressure. (In reality you get a few more per bar above that and fewer per bar below that.)

Working from a 80cuft scuba tank, 200 Bar at room temperature I get to fill my FWB cylinder 74 times before tank pressure drops below 125Bar. Doing the simple math of 3 shots per Bar I get 11800 total shots per scuba tank fill. I expect the total number of shots is a little high but it does seem I will get the better part of two sleeves of pellets through the rifle before I need to refill the tank.

I have a 80cuft scba tank, and with a conservative 4200 psi fill I will get 10,000 shots before it reaches 3000psi. Naturally I can do sub 200 bar fills, but the point may be a full tank gives plenty of trigger time.