Edgun R3 .22: Shot String, Air Efficiency, & Trigger
This will be a long post, sorry about that. Ran into the dive shop to fill up the scuba tank yesterday. The shop owner put on a pressure gauge to show me how much the tank was filled, because I was “hinting” at him that I could only fill the gun to 180 bars (~2610 psi) last time with a full tank. The tank was indeed filled to the maximum pressure around 3100 psi in this new fill. Interestingly, again, I only could fill the gun up to ~180 bars based on the gun gauge; but the gauge in the fill adaptor showed 3050 psi (~210 bars). It seems that the pressure of my Edgun was somewhat under measured by 440 psi or 30 bars. 🙄
I tested a shot-string using Combro Chronograph, which is a very small and handy chronograph installed at the end of the muzzle area. The starting pressure was 180 bar (based on Edgun gauge) and JSB Heavy (18.1 grains) was used. The first shot was low in speed (878 ft/sec), but the subsequent 35 shots were consistent with average 916.5±4.5 ft/sec (minimum 910 ft/sec and maximum 926 ft/sec). The regulator came off around 130 bars (I think) because of a little rise in speed for several shots and then the speed dropped to around 840 ft/sec for about 13 shots in parallel with pressure drop. The POI (at 30 yards) started to drop slightly (~0.2”) at shot #37 (or the regulator was off at this point?) The POI didn’t further drop until pressure went below 105 bars. I got 35 good shots consuming ~800 psi (from 180 bar to 125 bar) from a 289-cc air tube with average 33.8 foot-pound muzzle energy, which is about 13.1 bar-cc/ft-lb efficiency of air usage. If using Zoco’s data – green-line shot string, 220 bar to 130 bar for 57 shots, ~32.5 fpe (http://talonairgun.com/forum/viewtopic.php?t=19488&postdays=0&postorder=asc&start=520), I got the number 14 bar-cc/ft-lb efficiency.
Based on the data from a shot-string of Royale 400 (without regulator; average 868 fps with 37 fps extreme spread) (http://www.network54.com/Forum/79537/thread/1318702313/FX+Royale+400+.22+-+90+shot+string+with+chart-target), which consumed 0.94 bar/shot (220 to 135 bars for 90 shots) with ~30.3 fpe from a 400-cc bottle, the air efficiency is 12.4 bar-cc/ft-lb. Using another shot-string (http://airgunadvice.net/viewtopic.php?t=12183), from 220 bars to 179 bars with 36 shots (average 954 fps with 28 fps spread) at ~36.6 fpe, I got the same number (12.4 bar-cc/ft-lb) for air efficiency. Using the data from the FX Royale 400 review video of Ted in Youtube, average 33.53 fpe and 20 fps extreme spread with high power, I got 11.1 bar-cc/ft-lb efficiency. If the medium power is used (884 fps with 31.4 fpe and 13 fps extreme spread), the efficiency will be higher at 9.6 bar-cc/ft-lb. It seems Royale is a little bit better than Matador R3 (standard length) in air efficiency without much sacrificing speed variation in the un-regulator gun.
I think Edgun can be optimized by adjusting the combination of regulator and power to reach max efficiency, but it will need a lot of trial. Or this is already at the optimal condition when Ed designed and set up the gun. What do you think?
p.s
I also installed a Harris bipod BRM-S model 6”-9” in late afternoon, and ran a few shots under high-gust wind (>20 miles/hr) before dark. It seems to improve the unstable sitting of the gun and increase the shooting accuracy. 😛 Will test more tomorrow if weather is good.
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These babies go for nearly 500$ a piece. http://www.bixn-andy.at/index.php/website/kugelabzuege.html
Make a regular Match trigger feel like something from a Civil War blackpowder rifles. Unbelievably crisp and adjustable piece But … as the finer things in life it comes with a hefty price tag. 😯
The pull weight is adjustable between a bit under 2 oz to a bit over 2.5 lbs.
The Jewells are great at just over $200. I have a few Timneys on my large caliber rifles and they are big improvements over the factory triggers for less than $100 but not match level like the Jewells.
I set mine around 10 oz as well, the BR rifles at the same. To me a VERY crisp and predictable release is priority # 1. A trigger under 8 oz is too light, lifeless for my taste. How do yo like them Jewels??
I’m having new triggers on order for both Sako & Tikka. Google Bix & Andy. Superb Austrian triggers but those come with a price – a horrible price – but what to do … (:
Sent from my iPhone using Tapatalk 2. This POS iPhone sucks though …
I just grabbed 16 tins of it about 4 hours ago. 
I am tempted to get another 16 the way it goes in and out of stock. Those hogs.
PA has .30 back in stock too.
Wow. I figured you were setting them pretty low to be having those issues. I am setting them to 12 oz with a medium short stage one but I am primarily pest shooting. We used to set our Benchrest comp. guns at 2-3 oz but that really takes some getting used to and the guns were in a solid rest at all times. I have seen guys set their triggers to 4oz for prairie dog hunting but that was always way to light for me in the field. I have my Jewells set to about 12 oz on the PB varmint rifles and went with the 12 oz on my adjustable airguns. My Air Ranger .25 goes right down to 4 oz and has the best airgun trigger (after some work) that I have.
PA has .30 back in stock too.
sorting and measuring this evening and will find the one it likes and will prolly leave it alone and shoot it for a while like that,my 30 cal EG should be here next week so it will get alot of attention i have a feeling ill be firing up my compressor alot more when it arrives.
SECoda,
I like lighter trigger. I don’t have a gauge to know the pull weight. I just tune it to the weight I like. I think it should be less than 8 oz, maybe 4-5 oz, I don’t know. What is the pull weight of your guns?
In last several days, I always tune down the trigger weight little by little in each day to get some feeling on it. I will try the “Front-Screw For All’ tomorrow as Dr. Edgun suggested.
Brother Fannman,
Although it has 45 shoots (a full fill?), that is a decent string (see picture 1). Only 2 hiccups, that’s all. I don’t know what else you can ask for. Compared with your previous strings, this one is the best. If this is repeatable and your goal is 900 fps, then you pretty much done your tuning, I think. Your gun is relatively new, so it should get better with time.
Or take a look picture 2. Will this make you feel better? :winkn:
You need to find the head size your matador like to eat.
Picture 1
Picture 2
tell me brother I was thinking I was gonna have to pull reg to see what was going on then I figured I would back the hst down and go at it again from a full fill and those numbers came up,i think I had seen where you can get close within 20 shot or so and kinda get a clear picture as to where your at or I think you can,i bet the others on here who know more could explain it better.
Backside’s a bitch (just ask H 😯 😯 t). You can’t just adjust the HST back down in small increments. I been trying to get an answer as why that is.
big learning curve today on getting back in front of the reg as ive heard oldgoat say,i was on the backside for a while and pulling my hair out and figured out I needed to back down the hst and start over creeping up on the reg,i had my 22 cal R3 fps down in the 880s and thanks to wingman I have started pushing it up some and sorting pellets to stop the wobble,
Tedd, you have told me several times on the “front-screw for all” story. I did try it before I mod my trigger. But it didn’t work out at that time. Now, I have iron out the mechanical imperfection. It is the time to try different settings again. In fact, I did test out “one-screw” trigger when I was installing the screw back. As you said, it was super light, and I was afraid of misfiling the gun by just “touching”. I don’t want to kill my double-panel window again, but will certainly give another try on single-screw.
Yes, when I adjusted the length of the trigger rod, I have checked if the trigger plate is parallel to the trigger housing to facilitate the screw to pivot the plate (see picture). I have been shooting with the “new” trigger for several days. One of the problems I had before is that the pull-weight is extremely high (“trigger-bind”) in the first shot when the gun was un-fired for one or two days. This phenomenon is gone now. So far, the trigger pull is very consistent and this has improved my shooting.
My .25 has new style trigger (one-screw with hump). It is good, but the revived .22 trigger is much better than the .25’s. I really enjoy the “new” trigger – shoot with confidence.
Same as you Tedd, I am thinking of modding .25 trigger now. Sir Ville may be interested in removing the hump for us. 😉
Hump is my middle name . Bring it on, Boys !
Endo – what trigger pull weight are you targeting?
Thanks Tedd and Sir Ville.
Tedd, you have told me several times on the “front-screw for all” story. I did try it before I mod my trigger. But it didn’t work out at that time. Now, I have iron out the mechanical imperfection. It is the time to try different settings again. In fact, I did test out “one-screw” trigger when I was installing the screw back. As you said, it was super light, and I was afraid of misfiling the gun by just “touching”. I don’t want to kill my double-panel window again, but will certainly give another try on single-screw.
Yes, when I adjusted the length of the trigger rod, I have checked if the trigger plate is parallel to the trigger housing to facilitate the screw to pivot the plate (see picture). I have been shooting with the “new” trigger for several days. One of the problems I had before is that the pull-weight is extremely high (“trigger-bind”) in the first shot when the gun was un-fired for one or two days. This phenomenon is gone now. So far, the trigger pull is very consistent and this has improved my shooting.
My .25 has new style trigger (one-screw with hump). It is good, but the revived .22 trigger is much better than the .25’s. I really enjoy the “new” trigger – shoot with confidence.
Same as you Tedd, I am thinking of modding .25 trigger now. Sir Ville may be interested in removing the hump for us. 😉
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I was going to tease you guys that the Swedish Benchrest competitions are dominated by one trigger (#6). I never owned Jewell’s BR 1.5 – 3.0 oz trigger but it is supposed to be a hummer… It is about $185 here…
$500 for a trigger? OMG 😯
Make a regular Match trigger feel like something from a Civil War blackpowder rifles. Unbelievably crisp and adjustable piece But … as the finer things in life it comes with a hefty price tag. 😯
The pull weight is adjustable between a bit under 2 oz to a bit over 2.5 lbs.