Karma Regulator/tank pressure ?

Your reg is around 150 bar (2200psi). "Tank" refers to what one fills their gun with (SCBA tank or SCUBA tank). What's on the gun is a Bottle, tube or reservoir. Be sure you have nomenclature straight. Might want to mention gun model, max fill pressure, etc. You could look in a manual for gun to get max fill pressure. One of my regs are set @ 160 bar. Don't know if that neighborhood is OK for YOUR gun. More specific info you give, better answer you'll get.

Don't know the gun, but a 2200 reg pressure is certainly trending for higher output levels.
Caliber and projectile weight your shooting is ?

Guns apparently react different to being shot when the main air supply pressure is below the regulator set pressure. On my 5 regulated guns by 3 manufacturers the only effect is the velocity starts slowly falling. I have seen comments that some guns can be damaged but that isn't the case for mine. Buy still I try to shoot almost exclusively when the main reservoir is higher pressure than the regulated pressure.

ddkroetz said:

Sorry for wrong description, I'm still learning. It is a 22 cal 18,3 gr pellets. Reg pressure is 2200psi, bottle pressure is 2600psi. My "tank" needs topped off, it's only at 200bar. Turning reg pressure down decreases velocity, correct?

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Not necessarily ... hammers weight and spring rate driving it all apply.
If only so simple .... some reading and hands on will bridge this knowledge gap.

ddkroetz said:

Newbie here trying to get educated. Just bought a new pcp air gun, reg pressure is set at 2200psi. Tank pressure is at 2600psi.I assume that this is the relationship that I need to maintain, tank pressure higher than reg pressure? If I turn down the reg that reduces fps? Is 2200psi a normal reg pressure with a 70cc plenum? Thanks in advance.

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@ddkroetz I suggest that you start searching for and delving into "PCP tuning" threads to begin understanding this topic and the relationship between components like the regulator, reservoir pressure, hammer spring setting, and hammer weight.

Here's a link to get you started

Which air gun are you shooting?

ddkroetz said:

Thanks for the link, I have Karma SLS and an FX DRS both in 22cal.

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The DRS has a fill pressure of 230 bar, the Karma is 310 bar, if your compressor can fill it that high. Your reg pressure isn't affected by your fill pressure until it gets lower than the regulator is set at, at which point you will fall off the reg and your velocity will start decreasing with every shot.

The settings for the regulator and the tank pressure are based on maximizing the shots per fill without loss of accuracy. Everything is a compromise but these settings are meant for 18g pellets.

The tank fill nipple is difficult to attach and remove a standard coupling. This type of coupling makes this much easier to connect and disconnect. Sold by Amazon as well.

I like to test multiple weights of pellets in new airguns using ammo from multiple manufacturers. Always JSB and H&N, sometimes others. The capability of the airgun to move the projectiles is a factor. My Prod, for instance, can't reasonably get 14.66 grain pellets to 800 fps so I did not test 18 grain and heavier pellets in it. My other two 22s easily push 18s well over 800 so they got tested with 21 and 25 grain too but not with 14.66. I'm sure they would shoot them but I'd need to drop the regulator pressure to get to a reasonable velocity. Once I decide what I think the gun likes to shoot I like to try different velocities to see what seems to be best. I view the regulator setting as the "big" velocity adjustment and the hammer spring as the fine tuning adjustment. Usually you want to be 3-5% below the peak velocity for a given regulator setting but I go above and below this looking for the "best" velocity. My Caiman is a bit lower than this, however, with what seems like the most accurate velocity so I will probably lower the regulator setting. The extreme spread (ES) is a little high and I think that may be related to trying to reduce velocity too much with the hammer spring. First shot velocity is also a little high.

Fx king 600 in 30cal..does my regulator pressure need to be 165 bar for a good speed on day a 50gn slug?