Impulse
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I did the thing that loads of people say not to do; I bought a hand pump for my HPA tanks. Honestly, I'm pretty happy with the results; didn't take me too long to fill my 10ci tank that I will be using with the VSR.
Will try the 48ci tank when that finally runs out (won't be for a few months because I don't even have the Polarstar F2 for the m14 yet), which could take a lot longer and may not be too practical, but for the 10ci this hand pump is wonderful.
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Speaking from experience, 13ci to 3000PSI takes about half an hour (not accounting for a break to allow the pump to cool down if needed). 48ci to 3000PSI took me about 2 and half hours (which is accounting for cool down breaks, because there is no way of avoid that thing warming up more than is ideal with a larger tank). For me the most notable change in how hard it was to pump was going from 2300ish PSI up to the 3000 area, YMMV. And with a larger tank obviously you spend longer pumping at those higher pressures, hence the sizeable increase in time taken... alongside needing more breaks for things to cool down.
From 0-2300 it's pretty much a breeze, just need to make sure you're maintaining the proper technique throughout and not getting lured into the temptation of fast strokes equals faster fills. Should be stoke down, wait a second, stroke up, wait a second, stroke down, wait a second etc etc.
Hand pumps are a solid option as a primary means of filling smaller tanks, especially if you have a few to avoid having to pump during lunch breaks. They're good for topping up larger tanks if needed, but I don't think they're particularly suitable as a primary fill method for larger tanks. My personal experience would also say hand pumping much over 3000PSI would be really hard, so would definitely advise against it for tanks that go North of 3000PSI.
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I noticed it was significantly more difficult between 2000 and 3000 too. Fortunately it didn't take long to fill that with large strokes and it seems like the psi has settled to around 2600psi, as I didn't want to risk over-filling it. I'm constantly paranoid of screwing up and exploding things and seriously hurting myself
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Aye, you definitely hit a point where it's more body weight than arms than are getting you a proper compression. Taking it safe is never a bad shout, even with the protection of burst rings covering you from anything catastrophic, most of the gauges on the hand pumps shouldn't be trusted as accurate haha. It's pretty crazy how much of a dip you can get once everything has cooled down.
