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[sacshooter]

I am working on another fill calc spreadsheet and I need some feedback . I am sure others will find this information useful as well.

Could you please reply to this post with:
1. Gun Model
2. Caliber (.177, .22, .25, ??)
3. Fill Pressure (ie 2800 psi)
4. Typical number of shots taken before a refill
5. What is the ending pressure in the gun. If you closely watch the gauge when you refill the gun the needle moves fast then stops or slows for a second when the pressure in the hose equals the pressure remaining in the tank.

Thanks

Roger

[ssscottg]

1. Gun Model - Marauder
2. Caliber 22
3. Fill Pressure 2800
4. Typical number of shots 30
5. What is the ending pressure in the gun. 1800
If I keep shooting past 1700 the shots start to go low.
If you closely watch the gauge when you refill the gun the needle moves fast then stops or slows for a second when the pressure in the hose equals the pressure remaining in the tank.
Yes it works pretty much like that

[lamerabbit]

I have an update on my Marauder since I have tuned it.

1. Gun Model - Marauder
2. Caliber 177
3. Fill Pressure 2400
4. Typical number of shots 30 plus
5. The ending pressure in the gun is 1850 PSI
6. Velocity is right around 910 with the 10.5 Crosman Preimers


1. Gun Model - Marauder
2. Caliber 177
3. Fill Pressure 2300
4. Typical number of shots 25 I will only go to 20 during a field target match
5. The ending pressure in the gun is 1800 PSI

When the gun gets below 1800PSI the velocity falls off giving a large zero shift.

You may all wonder why I am using such a low charge pressure, simple while I could get more shots per charge with a higher pressure, I also will have to charge the gun higher and refill the tank sooner. This way I can run the tank down to almost 2000 psi before having to refill. It is a 20 plus mile ride for me to get my tanks charged, and I am a bit lazy on that so, I have three tanks. I guess I should buy one of those 4500 PSI jobs, but I bought these tanks before there was such a thing, least wise before they were affordable.

Jim

[hawkeye]

1. Gun Model: Marauder
2. Caliber: .177
3. Fill Pressure: 2500 psi
4. Typical number of shots taken before a refill is about 25 shots at 930 fps
5. The ending pressure in the gun is about 1900 psi.

I use 2500 psi as a starting pressure because I'm using a SCUBA tank as an air source. This gives me more fills before I have get the tank refilled.


Tom

[Boris]

First gun:
1. Gun Model - MRD
2. Caliber - .177,
3. Fill Pressure - 2700 psi
4. Typical number of shots taken before a refill - 35 at 895-910 fps (10.5gn)
5. What is the ending pressure in the gun. - 2000 PSI

Second gun:
1. Gun Model - MRD
2. Caliber - .177,
3. Fill Pressure - 2800 psi
4. Typical number of shots taken before a refill - 50 at 845-855 fps (10.5gn)
5. What is the ending pressure in the gun. - 2000 PSI

[Bruce Jarrett]

1 Marauder
2 25
3 200 Bar/2900psi on Benjamin pump = 2850psi on gun guage
4 8 shots
5 2550psi on gun guage
This gives me great groups, Standard Deviation of 3.2 It takes 34 pumps to recharge and I can reload the mag while I'm resting from pumping.

[tjbryner]

1. Marauder
2. .22 Caliber
3. Fill Pressure 2850 psi
4. 30 shots taken before a refill
5. The ending pressure in the gun is 1200 Psi

[ChookNZ]

.22cal marauder start at 2600psi: 20 shots give ragged 1 hole groups at 25meters with H&N barracuda Field Target Trophy, H&N Baracuda Sport Match or beeman Kodiak double gold. Recharge at 2000psi, less work pumping and keeps the accuracy as stated. 760ft/sec/10 shot average. All pellets round 21grains.

[zae333]

1. Maruder
2. .177 cal
3. Fill pressure: 3000 psi
4. 50 shots
5. Ending pressure 1900 psi

My p.o.i. drops during the last 10 shots, but only by a 1/4 inch or so at 30 yards.

[Walx]

1. marauder
2. 22cal
3. Fill 2500psi
4. 30 shots
5. Refill at 1500

Shooting 21.1g Kodiaks average 750fps
This is a brand new tune
Spring 3 turns in
Hammer 12 turns out
Port 3.5 turns open
When I figure out how to post an excel graph I will. I really like the curve.