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In reply to Post #9
Hi, Coleman C500 canisters are steel not aluminium.
They rust in the top.
Plus test with a magnet, it sticks anywhere on em.
Bob
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In reply to Post #24
This is it, just shake/ warm the can, take off any wetsuit and you can empty it.
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In reply to Post #22
How little they cost...Baller..  
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In reply to Post #23
Why would anyone even consider disposing of a 25 % full gas cartridge ? You just use it until it's almost empty and then just place the canister in a bowl of hot water or use a USB heater to use the remaining gas. I'm truly flummoxed 🤔
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In reply to Post #22
Each to their own... But it honestly only takes a matter of minutes, and allows you to reclaim the 25% of gas in each can that would otherwise be thrown away.
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I personally cant see the point of getting the dregs out of a almost empty gas canister. Much easier just to buy a fresh new one for how little they cost.
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In reply to Post #20
Absolved of all liability 😁
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In reply to Post #19
Warning added 
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In reply to Post #1
I'm all for saving a bit of money here and there and don't want to piss on your parade ! However, this sort of practice could easily lead to disaster for anyone not fully aware of the risks. Even with all the info already posted, there will be people on here that don't fully understand what they are doing. I'm not saying that it can't be done, because obviously it can, but maybe this sort of thing shouldn't be advocated on a public forum without some form of legal disclaimer. Do the canisters not actually state - Do Not Refill ?
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In reply to Post #17
Does your adapter have any means to regulate pressure, ie a screw or valve built in?
If not... Just be careful running the stove at full bore when on propane. The extra pressure of propane could literally spurt liquid fuel out everywhere, ie all over a hot stove.
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In reply to Post #14
I have found the adaptor to connect my stove too 
I have two, but one won't seal, but an additional O ring would sort that if needed.
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In reply to Post #14
900g is about right, I've had them over a kilo without any issues. They have a pressure releif valve so you shouldn't be able to blow one up.
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In reply to Post #8
I do have a few coleman 1lb bottles so I can have a dabble with them.
I have the adaptor, but it isn't as straightforward as you have to unscrew to weigh it.
Can anyone tell me the weight of a filled coleman 1lb bottle...
I have marked the empty can with 421g, so about 15oz, and the full bottle should have 1lb of gas in it, so about 2lbs (32oz, 910g) full.
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The main takeaway is NOT to fill/refill them with pure propane.
It's highly dangerous, due to the increased vapor pressure of propane that is outside the safe working limits of the aluminium type camping cylinders that hold mostly butane.
They'd already be making them, and selling them to people who climb mountains in low temperatures - if it was safe to do so.
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Tackle