SpudFiles

How much pressure or psi is in the air chamber "when pumped" of a real air rifle? lets say that the rifle is 1000fps.

I am no gun expert, I dont even own an air rifle but my mate told me that he used one before that was pumped to 3000psi with 8 pumps.

it could vary on caliber,type of air rifle and projectile weight. most .45 cal big bore air rifles shoot around 800fps with a 3000psi fill

Pre-charge air rifles are typically pressurised to 3000psi. Hence, they can be charged directly from a scuba bottle. A hammer hitting a small poppet valve in the end of the chamber releases a small amount of air at high pressure driving the projectile down the barrel.
This setup allows the rifle to be tuned to a certain extent...... Eg:- Heavier hammer/spring = longer dwell on the poppet valve = More power but fewer shots....A lighter hammer/spring = shorter dwell = less power per shot but more shots.
Airguns of this sort of design can be very powerful. There are photos on the Quackenbush website of a bison that was taken with a .50" cal gun! They are also used for hunting wild boar.


The momentum of the piston in a springer air rifle also generates pressures close to this before the pellet starts moving.

Im talking about a .177cal. air rifle 1000fps-when pumped how much pressure/psi is in the air chamber?

Not a big bore air rifle.Don't have one coz damn those things are too darn expensive.thanks!

Still about 3000psi would be my guess. There are many factors,- such as barrel length etc. which would affect muzzle velocity so it's very hard to say exactly what pressure you would need to achieve 1000fps.

Typical rifles are filled to 200-240 bar (2950-3525 psi)

I fill my Daystate Mk3 to almost 3400 psi and get at least 60 shots at 800-900 feet per second (for a 0.22 1 gram pellet)