MarauderAirRifle.com

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

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

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

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

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

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.

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

.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.

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.

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.