Minimum PSI to shoot JSB exact heavy 25 cal
Does someone know how much PSI is needed so that the JSB exact heavys 25 cal still shoot straight? I was shooting and after 100 shots, the pellets POI started to drop, since I have no gauge on the airgun and no crony, my guess is that I need to refill my tank (my power wheel is broken, so I think its at 1).
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http://www.talonairgun.com/forum/viewtopic.php?t=16217&sid=c91fb780bd6cc341f7ed1e9873e612c5
no reg, condor 24″ barrel,
Awe, PB, thats not fair…yes a few have there 60+fp guns tunned down to 7fp just so they can get 100 shots..but its not the norm.
Next thing you know Dyotat..will jump in and tell us all about his 350+ shots off a 62ci tank, and modified Etac
These things are cool, but not the norm.
Beanmedic is right. I could not have said it better. Particularly the point about the TTTA. It helps to know your pressure for every shot… It made a huge difference for me….
too many factors to have a simple answer. But, if it is primarily accuracy you are interested in I suggest you pick a fixed range that you are most likely to shoot. If paper targets that’s easy. If critters, get a sense of what range you will typically use. Then set up a target at that range and fill the bottle to 3000. Using sandbags or similar and a single brand of pellet, shoot and watch. If you don’t have a bottle tank gauge on your rifle, count your shots and you will find where the shots group tightly before starting to drop. Air back up to the same start pressure and when you reach the shot number where you previously saw good grouping begin, use the method already described (begin a refill and listen for the click when the air pressure begins to overcome the pressure in your gun’s tank). Look at the fill gauge and that is your “sweet spot” pressure, for that pellet, range, etc. You already have recorded how many shots before you saw the accuracy wane. That is when you air back up to the “sweet spot” pressure again.
Each gun will differ. Each pellet brand/weight will likely differ. Some will shoot consistently over short and long range (with elevation compensation). If your JSB pellets don’t group well, try another brand. (My TalonSS LOVES JSB pellets at 2400 – 2600 psi). And that at power level 4. Not the hottest round, but it goes through squirrels just fine out to 30+ yards.
Chrony can certainly help. Particularly with tweaking for best accuracy AND power. But like many have said before, it don’t matter how hard the pellet hits if you miss the target.
My opinion, before you buy a chrony, click the TalonTunes banner above and buy a TTT Adapter. Then you can easily conduct the accuracy test described and monitor you bottle pressure in order to top off when needed to keep accuracy. And then when you do buy a chrony you will have the pressure readings to go along with the fps readings. [/b]
@Jerry I was just curious 😆
NObody gets 100 shots huh, here is a few shots,
http://www.talonairgun.com/forum/viewtopic.php?t=16217&sid=c91fb780bd6cc341f7ed1e9873e612c5
no reg, condor 24″ barrel,
Since you have no gage on the gun; what does it matter how many psi you need for the last good shot, you’ll never be able to know?
Its a stock Condor 24 inch barrel hi-flow valve. I got 100 shots + – 5 out of the 3000 psi fill, cause it was a new tin with 150 pcs, now there only 50 left.
Thx for the accuracy advise Charlie.
Well a good guess…
It would be helpfull to know what gun U have, and the barrel length !
If its a Talon or Talon SS, with standard hammer weight setup…
Then a reasonable fill pressure is 2300 or close psi.
For a stock condor 24″ barrel, then 2700 psi is good.
Shoot down about 500psi from above..20-30 shots…refill
If your really getting 100 shots, then U must be using Co2. NOBODY gets 100 shots off a stock HPA tank.
Im not getting an AF screw, getting steel once. The range is around 18 m. The tank was filled to 3000 psi. I still need to figure out the optimal fill pressure, but for that I will need a chrony.
Thx for the accuracy advise Charlie.
If your replacing that screw with a AF screw, forget it, your replacing shit with shit.
Go down to ACE Hardware or what passes for it in your location and buy a steel one.
You not telling us much about the shots dropping out of the group, perhaps if you told us the range that would help.
I would not want to shoot much more than 25 shots from a 2700 PSI fill at 900+ to maintain the best accuracy from 35 to 100 yards.
Regards,
Roachcreek
The screw is broken (plastic piece of s***). The new screw is in the mail.
What could possibly be wrong with the power wheel you can’t fix it?
Lol, talk about stumbling around in the dark with your hands tied behind your back!!
You can get a bottle psi reading by hooking up to your pump/ scba tank. As you pump/refill the needle will go up quickly. The moment it slows down (you may hear a click as the valve seal pops open) that is your air rifle pressure.
Start with a 2300psi fill and see how it shoots. You really do need a chrony. After the rifle and fill gear, its the next most important purchase for your gun. It’s essential if you wish to get the most from your rig.
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🙂