rifle psi

[roughboy]

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

[shud_b_rite]

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.

[chaos]

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

[Slugfoot]

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.

[roughboy]

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!

[Slugfoot]

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.

[jackssmirkingrevenge]

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)