The problem is that at 250 bar you may not get that may fills with it.Originally Posted by secretagentmole
250 bar at 500cc is 125,000cc at 1 bar
S200 cylinder is around 150cc and fill to 190 bar, shoot down to say 130 bar? 150cc at +60 bar needed to top up, 9000 cc at 1 bar.
But you only have 500cc at 60 bar difference before the buddy bottle is down to 190 bar itself, which is 30000 cc at 1 bar. So doing the maths, you'll get about 3 fills before you're down to 190 bar in the buddy bottle, depending on whip length. You'll get maybe 1-2 fills below that, but they'll drop down below 190 bar quick.
Depends on how long you're out for and how much ease you want, and carry weight. If it's in the back of a car and a short walk, or you're shooting from a fixed position where you can take a small bottle then a 3L 300 bar bottle will give you a lot more fills for probably only £20 more and it only weighs around 4kg if you get a stumpy one and around 5-6 if you get a long one.
A 3L 300 bar bottle will give you about 330,000cc at 1 bar overhead, meaning you'll get about 30 fills before dropping down below 190 bar.
I've got a stumpy 3L I can weigh if you're interested.
If you're walking around and carrying the buddy bottle then it may pay to go for a 500cc, but you're paying a lot for that luxury.
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