Filling bottle?

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Personally, I’d go with a 74 cubic foot tank. I have two of them and have only ever needed one of them at a days session of a lot of shooting my .177, .22 or .25 rifles at my gun club. Sure the great white from Air Tanks Plus is bigger , and so is the price, but the 74 gives a ton of refills.
I believe AofA has a fill calculator on their site to estimate how many fills you will get in a rifles certain size onboard tank.
 
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There are calculators that will tell you how many full fill-ups you will get. I use a 45 minute SCBA tank which is about 66 cubic feet. I get at least 10 full 250 bar fillups on my P35s. It depends a lot on how much air your gun stores and at what pressure. Bottles don't really give 300 bar refills since they normally are only filled to this level and the pressure starts to drop as you remove air. But once my tank cannot fill my guns to 250 bar I do not have to stop shooting. I can fill to a lower pressure I will just have fewer shots until I hit the regulator. I wouldn't want to do that if I was competing but for informal shooting having to refill your gun more often is at worst a minor hassle. I usually refill my bottle when it gets down to around 3200 psi or a bit less. But I could keep using it all the way down to around 150 bar (about where my highest regulator is set).

If you want 300 bar refills it is better to use a compressor IMHO. You can get them that run on your car battery or even a cordless power tool battery. The small compressor could also fill to lower pressure, of course. It won't be as fast or as quiet as a bottle but it is a viable option.
 
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JimD said:
There are calculators that will tell you how many full fill-ups you will get. I use a 45 minute SCBA tank which is about 66 cubic feet. I get at least 10 full 250 bar fillups on my P35s. It depends a lot on how much air your gun stores and at what pressure. Bottles don't really give 300 bar refills since they normally are only filled to this level and the pressure starts to drop as you remove air. But once my tank cannot fill my guns to 250 bar I do not have to stop shooting. I can fill to a lower pressure I will just have fewer shots until I hit the regulator. I wouldn't want to do that if I was competing but for informal shooting having to refill your gun more often is at worst a minor hassle. I usually refill my bottle when it gets down to around 3200 psi or a bit less. But I could keep using it all the way down to around 150 bar (about where my highest regulator is set).

If you want 300 bar refills it is better to use a compressor IMHO. You can get them that run on your car battery or even a cordless power tool battery. The small compressor could also fill to lower pressure, of course. It won't be as fast or as quiet as a bottle but it is a viable option.
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Get 1 tank (say 60 minutes ) and a gas booster like altaros makes and fill your gun from that 1 bottle all the way down to almost empty ... that would be how I will eventually go about this same problem . The booster doesn't require electric so you could fill with it in you truck bed or on a cart at the range . The booster is slightly more cost(or equal depending on bottle manufacture ) then a bottle but once you have one its done and then you could even use it to fill your bottle from a garage compressor making it even more usefull .
 
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