AA S400 MPR FT Came In!!!!

[Rdsail]

One update: I have a Robert Lane Regulator coming in the next couple of weeks. I had him set it up at 120bar. I have read that most people set them around 90bar but I'm trying something different. Per my efficiency calculations. the MPR at 90 bar is inefficient with the use of the air. and also it is not as accurate once you drop bellow 100 bar. At 120bar each shot will consumes about 10-11psi where at 100 it uses almost 15psi per shot. This translates to 110 shots at 120 bar and 100 at 90. I know the physics will change some with the regulator so It would not be to hard to turn down if it does work out per my theory.

Next is a group I shot from 40 yards. This is 6 shots. The firth shot was a little off the group so I took an extra one. I was checking my zero. When I'm shooting from sitting position I was hitting left. This group shoes that it is me pulling and not the gun.



If I count the off the groups shot I get .230 group CTC and if I don't count it I get 0.128 in CTC

Not bad at all

[gonzav]

Excellent shooting!

[gonzav]

here is the link. you want to http://www.sculpteo.com/en/print/sidewheel3/kfi3dMwu?uuid=WmwWKVCUKBekmhOAY68Xac

Rdsail,
I am planning on ordering the 3D printed side wheel you designed. How is the side wheel attached to the Mueller side focus knob? Is it friction fit?

[Rdsail]

It has 2 attachments. 1 I added 3 set screws on the boddy of the know. I put electrical tape not to scratch it. 2.- you have to unscrew the side screw on the knob. You have to use pliers. I bought a 4m screw. To replace the original screw.

[gonzav]

It has 2 attachments. 1 I added 3 set screws on the boddy of the know. I put electrical tape not to scratch it. 2.- you have to unscrew the side screw on the knob. You have to use pliers. I bought a 4m screw. To replace the original screw.

Thanks a bunch! Saves me time from 3D modeling one from scratch. Just ordered the 3D printed side wheel. I assume the screw is metric M4.

[Rdsail]

That is correct, it is a metric screws. If you have any questions once you get it send me a PM. Then I'l send you my phone.

[Rdsail]

My Robert lane Regulator came it!!!!
I will be installing it in the next couple of days.

[thercman]

Your groups look great! I was considering an air stripper on mine and this has convinced me. I am also eagerly awaiting the test results on the regulator.

Cheers,
Greg

[Rdsail]

I installed the Regulator. This are preliminary. I will be running full a full string tomorrow. The installation took about 1 hour. It was easy.

Here are some numbers:

I filled up to 2800-2900psi. I was not measuring carefully. I took 30 consecutive shots. I'm using JSB 8.44

High 798
Low 792
Spread: 6fps
average: 796

This puts my right under 12fpe.
The number are very good I just had to adjust the power about ⅛ of a turn.

To say the least I'm very happy.

I'll post a full string starting at 3000 psi down to the regulated pressure which should be 120bar or 1740psi
base on calculations that should give me roughly 114 shots base on 11psi per shot. My guess is that it will be closer to 100. Usually the efficacy goes down some with a regulator. This is an increase of 40 shots.

[Rdsail]

I finally got to run a full string. It took me a while because I had a leak through the breath hole.

The are positives and negatives about the regulator.

Positive:
Extreme spread got cut in half
Standard deviation is about the same

Negative:
efficiency went down

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The shot count is about the same. Although if I consider the same spread I gain about 10 to 15 shots. But then I'm off the regulated pressure of 120bar.

Robert lane sent me recommendations but I would have to make the hammer lighter which I'm not willing to do at this point

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After doing this test I adjusted the internal power adjustor. This adds tension to the poppet spring letting less air out. I adjusted it so that the there air flow adjuster is almost fully open. This removed 1 turn in the choke. It I just use it to fine tune the power. I ran a short sting and there was a small improvement in air used per shot. It when from 17.5 psi per shot to about 16. The spread seamed to be reduced by about 1 fps or so. this would gain me animal amount of shots. 76 instead of 70 based on this shot string.

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Conclusion: It is had to say if the regulator was worth it. The gun performed very well stock.

[woogie_man]

The nice thing with the regulators is that you don't have that sweet spot.  The one thing I didn't like was driving that breather hole.

[Rdsail]

yes woogie but you get over it quickly.

[Rdsail]

sighting for the bench 25 yards - 3 groups of 5. Shot From the right to the left. 5mph wind coming from the left. I adjusted a few click on the elevation.

[woogie_man]

Agreed!

Saving up again for another regulator from him for my tdr.

[wasatch]

I also installed a RL reg set at 95bar in my MPR FT and adjusted valve spring preload set to 5.5lbs and ports opened to 3.7mm.  Using the stock hammer my air usage was 14.5psi/shot at 12fpe with air metering screw at about 2 turns out.  Then I installed the anti bounce hammer sold by RL.  Air usage went down to 12.5 psi/shot with 130 shots from 200->95bar.  Air metering screw all the way open.  I think i can improve efficiency some more by shortening the hammer spring, increasing valve spring preload and trimming the antibounce hammer to get the power back up (see pic).

[Rdsail]

very cool. The main reason that I wanted to keep the regulator at 120 is that for some reason the gun seam to be more accurate at the pressure. When I went under 110 my groups opened up some. RL make some recommendations similar to what you are saying. For now I'm going to keep it at this setting. Seam to be very accurate and I'm getting 70 solid shots.

[Rdsail]

After a lot of research on trying to find a butt hook for my MPR I finally ordered one yesterday. I even considered making a set up to attach to my stock one. The problem I found was the cost of material and the work I need it to do. I don't have a mill which I would of need it.

I compared costs and features on the available hook on the marked. It all came down to the Competition Shooter Butt Hook.

http://www.competitionshooter.co.uk/shop/



One feather that I like is that you can buy multiple bases and easily switch it between different rifles. The number of adjustments is impressive.

I'll post once I install it. I'm guessing it will take about 2 weeks to get here.

[Rdsail]

I'll have to get counter sink. I can't remember if they are 4m or 5m screws. I had to get new ones before to extend the butt on mine. I have the countersinks to go on my drill press. I should be an easy task, just measure and drill. I'm guessing I will still need to add spacers for proper fitting.

[thercman]

After a lot of research on trying to find a butt hook for my MPR I finally ordered one yesterday. I even considered making a set up to attach to my stock one. The problem I found was the cost of material and the work I need it to do. I don't have a mill which I would of need it.

I compared costs and features on the available hook on the marked. It all came down to the Competition Shooter Butt Hook.

http://www.competitionshooter.co.uk/shop/



One feather that I like is that you can buy multiple bases and easily switch it between different rifles. The number of adjustments is impressive.

I'll post once I install it. I'm guessing it will take about 2 weeks to get here.

£135!!!!!!!!! 

[Rdsail]

lol. I hopes worth it. I just keep adding to it. between the regulator and the butt hook I could of bought another rifle. It is just part of the fun.