Optimal Reg Pressure for 177?

DrPutz · Dec 23, 2019

Hi Folks, I am trying to set up a used Crown for field target. What have folks found for optimal reg pressure for 177 (JSBs 10.34 and 13.43)? I currently have it down to 100bar, but the spring/hammer is a bit too heavy for that pressure. I have not found a suitable lighter replacement spring yet. My AA S510 has a reg setting of 95bar - following the tuning guide from lane, but it has a lane hammer as well.

Also I think that something is not working well, as I am getting reg creep. Also it looks like the hammer is hitting the cocking pin slightly. (I saw some dents on the hammer and can feel a slight impact on the the cocking arm. Maybe this means that the bumper is bad??

Thanks!

Dan

Motorhead · Dec 24, 2019

In many platforms ... 1600 is a great place to start IMO

Hobbyman2007 · Dec 24, 2019

I set my Impact to 90 bar with a short 300mm barrel for sub 12fpe shooting. The reg on the HW100 is at 100bar but shoots at 15fpe. I think the major difference is the hammer weight. The impacts is quite light and the Hw is on the complete opposite end and is very heavy ( I really need to fix that) . I’d run with whatever Scott says.

Chuck-in-Ohio · Dec 24, 2019

My Crown .177 is set at 110 bar and is running the original monsters just under 20 Ft.Lbs. Shot count is around 150ish.

No mods except for a barrel polish, resetting the hammer spring tension to max on the adjuster and hollering Yahtzee.

So yeah, Scott is right on the money for a good place to start.

Spray1Mark · Dec 25, 2019

As above 110 bar for the Crown in .177

Hubertus · Dec 25, 2019

I have 115 with the Vulcan geb4 .177

Works perfect with a weak hammer spring for my plinking needs in the basement and with the factory spring for full Power.

Motorhead · Dec 26, 2019

1600 PSI is 110.3 BAR ...... That confirms that number is pretty universal as a good stating place.

DrPutz · Dec 26, 2019

Thanks everyone for the suggestions. The rifle started out at 110bar, but sounded very loud and seemed very inefficient. I think that the hammer and spring is setup for heavier pellets and more fpe than the 177. I did find some lighter springs today, so I will try them out at 110 bar. If those don't work, I may have to go to a higher reg pressure. I am also concerned about the actual pressure, as the main gauge is 15bar too low (based on the tank gauge). So I am concerned that the reg gauge is off as well. I may have to replace both gauges to have more confidence in readings. Thanks again!

Jlacouturec · Dec 26, 2019

between 90 up to 120 bar.... it depends on the barrel lenght and how much energy you want to reach!

Search

Search

Optimal Reg Pressure for 177?

DrPutz

Member

Motorhead

Member

Hobbyman2007

Member

Chuck-in-Ohio

Member

Spray1Mark

Member

Hubertus

Member

Motorhead

Member

DrPutz

Member

Jlacouturec

Member