I think that's right.
But weight is just a check.
There is no way you can squirt in 53 gm in a measured way.
Fill it and it will stop filling when pressure equalizes.
Hopefully it will work but if not check weight and vent as Baz says.
Thank you folks, great group this is.
Thanks for your help folks.
I dont think it'll stop filling. CO2 doesnt fill by pressure it fills by weight.
It starts filling from 1 cilinder to the other because of temperature difference. (because you had yr cilinder in the freezer).
If there's a lot of temperature difference, it'll fill up fast(er). If there's too little difference, you wont get a complete fill.
You can easily overfill bulk CO2. But it shouldnt break yr Orings like pcp does. It'll be loud and inconsistent.
Just leave cilinder on few seconds with crane open. Than check weight.
When there's 53 grams in it, or near that, yr done.
ATB,
yana
Did you ever work out how to correctly fill your CP2?
I'm about to buy a CP3 and need some advice on filling with co2 from a fire extinguisher.
Sorry to drag up an old post.
All info you need is in this post
ATB,
yana
Be careful. I once overfilled one of my Walther CP2 cylinders by only 2 or 3 grams, but didn't vent down to correct weight before it warmed up and it blew a seal.
Vent down to correct weight immediately on filling.
Walther CP-2 Match, FAS 604 & Tau 7 target pistols, Smith & Wesson 6" & 4" co2 pistol, Crosman 1377,
Baikal IZH 53 pistol, Gamo CFX Royal,177, Umarex SA-10 CO2 pistol.