FPE from CR600W

From what i understand co2 will only get to a certain pressure by its nature.
Temp will affect the pressure. Hence the shot.
So im not sure how much you can actually gain but i dont think its that much. Think it would be close range for rabbits, dont see it doing longer shots. But there are ppl om site who have user knowledge.
Ive not considered them due to the power, though as a bird gun im sure it would be great.

Billbobnz wrote: If you do go bulk filled? Make a dummy 12grm cartridge out of aluminum with a 4mm hole drilled in from the end to a 1/8bsp hole tapped in the side, and I run 1/8 bsp fitting to std paintball fittings to the bottle. I can do some close upstairs and a disassemble of it all if you want

Hey Bilbo,
Hope it's not too late but some close ups of what you did would be amazing if you could!

I should run some JSB hades or exacts through it, it needs to come out to start the annual starling slaying haha

If you do go bulk filled? Make a dummy 12grm cartridge out of aluminum with a 4mm hole drilled in from the end to a 1/8bsp hole tapped in the side, and I run 1/8 bsp fitting to std paintball fittings to the bottle. I can do some close upstairs and a disassemble of it all if you want

Edited by Billbobnz - 02 Sep 2024 at 3:54pm

He put the fps and pellet type and weight on first page. You can get the fpe at muzzle off that.

Spot on. What tank are you using? Also what kind of FPE are you getting? Are you shooting light or heavy pellets?

I have roughly worked out I need a plenum of around 30cc ish if people are only getting around 565fps.

I have one shot at doing the plenum as I will be parting the pressure tube and putting in a regulator so the more feedback I can get on FPE the better the chance of having the correct size plenum, I have read people get a FPS boost from increasing their plenum size so I will go a bit bigger then needed to allow for any increase in FPS from it.

Having the reg should hopefully help with a consistent pressure in the plenum and I'm pretty sure I have found a simple way to maintain a consistent temp of the cylinder so the pressure out put is consistent.

Average running pressure on c02 is around 850psi but then due to being sensitive to temperature can go up or down from there.

Worst thing for the little cartridges is that also as you shoot there is a little power curve and rapid firing makes it cool down and drop fps.

I've modified both my cr600 and a crosman 2250 to bulk filled and each shot is so much more consistent + you get about approx 500+ shots from a tank and it cost me under $5 to fill at the local gas supplier.