220 bars shot string from .30 cal Matador short.
When I first received my .30 Matador, it was shooting at about 695 f/s. I kept adjusted my hst and the max I got was about 800 f/s. My gun now will not cock because I maxed out my hst.
I decided to tear down the gun and give it a lube job and an overall evaluation. I replaced 3 regulator housing O rings.
(2) of the 3mm x 25mm, and
(1) of the 3mm x 20mm.
Ed had the housing extended by adding a spacer to increase air volume.
Regulator was set at 160 bar.
I decided to increase regulator pressure to 170 bar and bumped the hst by about 1/8 of a turn from the original position ( I marked the original position).
Here is a string from 220 bar.
(1) 884.0
(2) 890.3
(3) 887.7
(4) 870.0
(5) 866.3
(6) 890.5 @ 201 bar
(7) 890.0
(8) 879.3
(9) 887.7
(10) 891.9
(11) 886.7 @ 182 bar
(12) 880.8
(13) 889.8
(14) 888.2
(15) 896.9
(16) 885.6 @ 168 bar
(17) 876.5
(18) 884.4
(19) 893.5
(20) 900.2
(21) 898.7 159 bar
(22) 885.8
(23) 859.0 @ 149 bar
(24) 846.0………….this shot sounded totally different than the rest, I think it is way off the regulator!!!
I know this is not the best string out of this gun, but I think give it time to break in and bring down the speed to about 865 with lighter hst, I can squeeze 2 more shoots out of the fill @ 220 bars and deviation also will be within 4-8 f/s.
I will retune with minor adjustment after a few thousand shots,
Johnp
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Seeing shot 21 at 898…. at around 160ish bar. with the reg set at 170 bar that means there is still sufficient air in the tube at 160 bar to sustain 880’s
also seeing that #22 was still right there you maybe able to set the reg around 155-6 and you should see 23-24 shots at 880-885 before a noticeable drop in velocity .
I agree with THE OLDGOAT….
My Standard 30 cal was similar to your tuned string when the gun was new untouched. The average was 871 FPS for 27 shots from 220 bar before it fell into the 840s. I decided to wait for a full 500 shots to do another. 🙂 Its weird some are set so low.
OK Oldgoat 😀 – explain how you know from the string that the regulator is still set a little high and the HST a little low????? Maybe the slight rise at the end of the string? That is valuable information. 😛
That is not bad at all .
A couple of fill cycles will likely smooth things out some.
Considering the size and power that is a good number of shots.
John: I can’t believe that you have voided your brand new Matador’s warrantee by removing the regulator and adjusting it!!!!! 😯
HEY, WAIT! 😆 :8:
AFTER you have shot the gun down past your new set reg pressure at least once, try another shot string with your current setup. The reg needs at least one full fill and shoot down past the new reg set point to stabilize. Two full fills and then shooting down past the new reg set point can be even better. If you don’t shoot at least 1 full fill and then down past the new reg set pressure, you can dive yourself crazy trying to figure out WTF is going on!
Don’t ask me how I know this! 😳
Your shot string looks great but; (you knew that there was going to be at least one but from me!). I think that you need a little less regulator and a little more HST to really flatten out your shot string and give you another 1-2 regulated 885 fps shots.
As you are right now, it looks like you still have a SLIGHTLY too high reg setting and a little weak HST.
Just my 2 cents that are worth about that much.
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Interesting Jamie but you can explain that relationship between air reservoir pressure, velocity, and the curve a bit more? SO the regulator can only go as high as what’s left in the air tube at 160 but the velocity is still near 900 – I see that. So you want the reg set to the lowest possible setting to achieve the desired velocity – is that the rule for best efficiency? How does the HST setting play into that? Why is the HST too low or do you just need to turn it up to make up for turning the reg down?
These bullpups are the first regulated guns I have owned. I am a regulator virgin. 😛
also seeing that #22 was still right there you maybe able to set the reg around 155-6 and you should see 23-24 shots at 880-885 before a noticeable drop in velocity .
I agree with THE OLDGOAT….