Case closed: Spread larger than 50fps in 54 shots
After performing some tests of speed vs. accuracy in my EDgun Matador .22 (Standard model) I found the best accuracy with the gun around 930fps (http://talonairgun.com/forum/viewtopic.php?f=34&t=32599)
I did the full string holding the gun in this setting.
Some observations:
1 – My weapon probably has less than 3k shots.
2 – The pellets were not selected.
3 – On the day that the string was made the temperature was lower than the day of speed tests. The string was made in a day with approximately 20°C (a cold day here in Rio de Janeiro – Brazil).
4 – I will repeat the string soon (my pellets over: cry:).
5 – Resting on sand bags (terrible support), the best groups in this configuration are 15 mm (edge to edge) 50 meters.
So, Houston, we have a problem?
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Viewing 15 replies - 1 through 15 (of 15 total)
:hoot:
Interesting! Toss in the chrony/light variables, and that could account for a substantial portion of the deviation. This seems to make it possible that a number of factors may contribute to the overall outcome!
I am curious to see how this plays out. It’s not as simple as it seemed at first glance.
Hoot:
The pellet variable won’t affect it that much but will bump out the the mid teens on ES and 4-7 fps on SD.
I did a few strings with sized and weight sorted pellets then threw in several known heavier and lighter with corresponding head sizes and the spread opens up a handful more fps over normal.
:hoot:
Ed does use a pretty heavy grease in his regulators! Thick, gooey, sticky grease. Several individuals on here have taken them apart and replaced the OEM lube with lighter silicone lubes.
Ed has to assume that most users, not on this forum, would ever disassemble their guns, or be able to re-assemble them if they did. So, he has to lube them for life. What better way than using truck grease that will never wear out, or get thin over time.
There’s a lot of variables here, but the extent of the spread is interesting! That’s a big spread for an Edgun.
Also, makes me curious whether a 1 grain heavier pellet, or a thousandth inch skirt difference, would affect fps that much. I don’t know, of course, but it’s a valid question.
I do know that past efforts in taking the regulator apart, cleaning it, re-lubing with a lighter lube has produced some interesting and positive results in accuracy, speed, and consistency.
It really shouldn’t take 20 seconds for the reg to refill the valve. But, if it does, then an extra heavy reg lube would be the first place I’d look. High viscosity will certainly slow down any mechanical movement.
Everyone wants to know the outcome on this question…it hits close to home!!!
Hoot:
Consistent chronograph readings are obtained only by repetition.
Build a jig to hold chrono and rifle a set distance apart with barrel level and sighted in a couple inches above chronograph and appx 3ft back.
You can’t reload and shoot rifle faster than the regulator can recharge unless there is a serious problem with the washer stack or oring inside. Trust me, I’ve tried as fast as possible and waiting 30 seconds between shots. Difference is immeasurable.
Your string is fine overall but definitely needs work. I suspect improper alignment with chrono along with mixed pellets. Regulator probably does need thurough cleaning it wait until you hit 4-5 k pellets through it.
JSB 18 pellets vary from 17.5 to 18.5 grains and head size from 5.49-5.53. You can see how weight difference and head size can really present some huge gaps in fps if you have a bad tin or two.
Start out with getting rifle and chrono aligned for every shot under same conditions. Do 10 strings for a real comparison and a solid pattern to emerge with mixed pellets.
Then we’ll move on from there.
I tried to maintain a relatively constant time between each shot, but not 20s.
Next I’ll wait longer between shots.
Yes, and I agree with you about chrony readings being inaccurate sometimes due to lighting conditions.
You do understand we are problem solving right ?
Keyser, 20 seconds is simply unacceptable. There must be a malfunctioning component(s) then in the reg if you have to wait that long. My Cricket’s reg will get to the set pressure very quickly right after the previous shot, and that’s chrony verified. The reg’s belleville springs, O-rings, lube, shaft may need to be inspected, and if need be, serviced.
Spin you have something to add to this conversation or you here to show another redneck HST tool 🙄
Wait 20 seconds in between shots? Fuhgeddabout it! Not a very good regulator then.
Another factor to consider is how fast you are shooting your string. You need to give the regulator time to fill. Looking at your shot string makes me wonder if you may have gone to rapidly. This has also happened to me. I have been told to wait 20 seconds between shots.
Another factor to consider is how fast you are shooting your string. You need to give the regulator time to fill. Looking at your shot string makes me wonder if you may have gone to rapidly. This has also happened to me. I have been told to wait 20 seconds between shots.
Thanks KS.
Once I complete this string, I thought that external and internal factors of the gun (not necessarily manufacturing problems) were influencing the result.
Before disassembling the gun, I’ll remake the string with another chronograph.
Then I’ll check o-rings and clean the regulator.
I’m not too worried. I know the quality of EDgun components and I think that’s not a big problem to solve.
I published this string as a way of disseminating information.
I know many people who have “fear” to disclose the defects of their weapons. I’m not one of these.
Before you go crazy breaking down your gun, cleaning the regulator and adjusting the gun for get your ES lower check your numbers against a different chronograph and at a different time of day. A lot of things can make a Chrony go wrong and it can drive you insane. Even the most expensive chronographs are only as good as the light they are receiving. My suggestion is start there then look to the gun for answers.
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Case closed:
I read here in the forum about this problem that are resolved by cleaning and lubricating the regulator internally.
Initially, I would only repeat the string and check some internal O-rings in search of some superficial problem.
But, besides the problem of string, my gun had a leak in the filling valve (which was solved by replacing its o-ring that was cracked and broke), then, as I had to disassemble the gun anyway, I took the opportunity to open the regulator and check inside.
That’s what I found:
The two internal O-rings were damaged. The smallest was just flat and the largest was skinned.
So I switched both, cleaned the interior of the regulator and lubed the spring washers with a thin layer of silicone Hill.
The result with the H & N Baracuda 21 grains (I was without JSB after doing this maintenance) was as follows:
A few shots later, my JSB arrived and the result was as follows:
I did not do a complete string because my cylinder is almost empty 🙁
Soon I will make and post the result here.