Interesting, i had never heard about any others doing that. It is the only one that I run at 4,000psi, All of them get filled to 4500psi except the t9. I wish i could shoot in my yard, I would have Karen's calling the po po over gun shots.

Acecaretech said:

That would be a 9L cylinder.

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I will forget that I only use metric for fasteners and questionable activities.

But when a heavy, long for caliber, boat tailed pellet gets around 950 to 970 feet per second, YESSS! I am giddy. And things just die. Cans are cut in half. A bell rings at long range....... YAHOO MOUNTAIN DEW ! ¡ ! That feels so good! As much fun as you can have with clothes on. Be well Brothers, dito.

The difference in reg pressures could be due to different barrel lengths? It will take more reg pressure to push a projectile the same speed from a shorter barrel.

Also - most FX are rated for either 230 bar or 250 bar. You don't want to go above those max fills as it will be harder on other parts of the airgun (ie: o-rings, seals, etc) and may exceed working pressures for some parts.

I don't see it mentioned but the one thing I see missing from the discussion are specifics on what projectiles and at what speeds. Do you have a chronograph? Most pellets do best out of most airguns at around 880 fps. Some like a little slower, some of the newer JTS and AEA pellets like a little faster, but 880fps is basically the ballpark.

Once you know where you want to tune the gun (ie: 880 fps) you take your ammo and start shooting over your chronograph to see what speed you are at. You will need to likely perform a combination of tuning the regulator setting and the hammer spring to find you're ideal tune.

Here are the details for a basic 5% reduced max tune (my words - don't think there's really a name for it):

1. Find your current max speed.
   1. Shoot over the chrono and record speed.
   2. Increase hammer spring and record speed.
   3. Continue to increase hammer spring until you max out your speed. Don't keep going once you hit max as there is no benefit.
   4. See where you max fps is. Your goal is to tune to 880 / 0.95 = 926 fps (will explain below)
2. If your max speed is above 926 you need to reduce your regulator a bit and start the process over. If your max speed is below 926 you need to increase regulator pressure and start the process again.
3. Repeat steps 1 and 2 above until you have a nice tune maxing out at 926 fps.
4. Now reduce the fps by 5% to 880 fps.

Your rifle is now tuned just before the knee of the power band at the regulated pressure. The reason you want to drop back 5% is that at max power your efficiency has dropped a bit and you are just blowing a bit of extra air out of the barrel. Dropping back 5% will give you a tighter ES (extreme spread of fps across a string of shots) and max shot count for that power setting.

A chronograph is important for the tuning you want to do.

If you search there are threads here which detail the process outlined above with much more explanation.

AzoresFX said:

Ok, thank you all for your help, my problem has been resolved, the law in Portugal does not allow PCP weapons to have more than 24 jules at the exit of the barrel, hence their low velocity.

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so this is something I need to do when I try to figure out how to help someone, although I have no idea what laws are in various countries, I had no idea that you were in Portugal, I need to remember how to view the members location because the rules are definitely different in different countries.. I'm trying to remember but is it correct to click on the name of the members post area to see where they are?
glad you got it resolved, I need to learn more I guess about getting around the site..
Mark

A little short on shot count but that can be remedied with a larger bottle from Best Fittings in UK. I get 120 shots with my .22.

Finally got the spring to replace the ram on my Gamo Bonne Collector.
Ordered a strong spring with .152 Dia. coils. Am happy with the results.
820 fps with Premiere magnum 14.3 gr. When will miss taking the gun
apart, will try with factory piston and different seals. Maybe even shim
the spring.

Bigbaby said:

I’m getting no or very little left or right POI shift with my .25 DRS Tactical between 50-70yds, maybe it’s indexed correctly. I’ll probably pick up a cf sleeve just to see if I can squeeze a little extra accuracy of it, but from watching Viking Airgunner, the 600mm sleeve will be a little short, I think he added 3 orings to correct the length on his DRS. That’s why I was thinking of getting a longer one and cutting it to the correct length, with a tiny gap on both ends. Sorry for my confusion on tensioning vs stiffening.

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Let us know how it turns out if you decide to try it

Karma red panda is a joke at 2500€, quality trouble, less power than on the paper, look at that :

and the last :

Ackley786 said:

I have several Ithaca Model 37's that are everything you could want in a pump shotgun and can regularly be found for $300-$500 in great condition.

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Uh….what? Lmao.

Check the valve seat. It can rotate and choke off the transfer port. My friend's panthera had this happen spontaneously for some reason.

Yes this is very normal as well as the long gun. It’s just the hammer in action.

I would propably try out the Ronin for going as silent as possible but still maintaining great accuracy. I would also try out the new moderators from DonnyFL. I just don't have experience on them myself.

I can't seem to find a tune. I've watched Ted's Holdover video and matched his tune but fps isn't very consistent for me and his slug tune didn't work for my PHC. I am shooting at about 905 fps most of the time. 7 of 10 shots is near 905 fps +/- 1-2 fps with 3-4 shots that either falls short ~890fps or high of ~924 fps. Reg now sits at about 147 bar. Just looking for the next steps... I am shooting .22 JSB 18.13gr. I want it to be at least 900 fps. POI shifts at 890fps and at the higher 924 fps.

Forgot to mention, I've tested and turn down the reg to 110 bar, but then I would need to bring the hammer tension up which makes it a lot louder. I don't really like the loudness so I returned it to back to it was before. Maybe I just didn't find the tune for that reg pressure?

Well I have nothing good to say about slip on lids.

CrashKT said:

I have a hand disability, what's the trigger like on that and potential lowest weight?

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Don’t know the V3 trigger but the U2 trigger - after adjustment - is very light. I’d imagine that Derrick can set the trigger up for exactly to your liking.

Edit: I should probably say that the u2 trigger can be adjusted very light, but does not have to if you don’t want to.

The Sharg is the kit, includes the pellet pusher. So you could have all 3 caliber available for the Throne 2. Don't know how complex the charge over is.

Nofilters said:

Xtra $$$$$$$$$$$$ an the fellow shooter is supposed to be ready to do that for you

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I'm talking about the fellow shooter, LOL.

For example it'd be nice if target N always had one color, M always had another color, and F always had it's color. Glance down, grab correct spool and string color, and no need to trace the string down to the target to see which string goes to what target.

Let's discuss the Xtra $ because I'd like to help out.

madeintheuk said:

Do you know who did it on here that I could get info from?

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Resealed by Cricket and it was loaded with blue/green grrease both inside and action. Anyone know what that grease is? The pic shows only a tiny amount that was inside.

Emjay4248 said:

After getting the U2 30 I was so impressed with the out of box performance that I bought a U2 25 within one week. Unfortunately 2 days before the arrival of the 25 the 30 blew its cork. Not sure what it is so it went back. Checked the valve and replaced the breech o-ring. Might be the regulator. I’m not disillusioned, things happen. In the meantime I’m happy plinking away withe the 25. I’m going to call AVS to get slug recommendations. Not spending altaros money and I might try Zam’s once I know the optimum diameter. Considering selling my fx’s and AEA’s Getting a little tired of tuning and tuning and tuning. So far the u2’s shoot almost anything from Jsb and Aea from very well to pellet on pellet @ 50 yrds. I’m also going to keep my 2 25cal Hubens.
It’s time to cull the heard as they say.

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It's likely your U2 .30 blew the o-ring that sits on the shoulder of the poppet part of the valve. It's a VERY common issue with the U2s. The latest poppets don't break any longer but the o-rings still break. You have to disassemble the rifle about 50% to get he valve out on the U2 (U3 made access to the valve with no disassembly).

I've tested about every popular weight and brand of slugs in my U2 .25 700. The best shooting slug is the AVS 44gr, dish base in .2513" diameter. Second best is AVS 44gr, dish base in .2530" diameter.

My reg. is set at 155-bar. Hammer is 3-turns OUT from flush with back of block. I have the carbon stock and the spring adjuster plug has room inside the stock for several turns of outward adjustment.

Velocity in Spring/Summer temps is about 950fps. I was getting about 935fps in Winter temps.

Slightly better than average 5-shot group at 50yds with the AVS .2513" from my U2 .25.

OHHHH...that rear cocking....... LOL

High angle targets have three factors that increase difficulty.

1) reduced vertical MOA allowance
2) more awkward shooting position
3) correction for reduced projectile drop when compared to typical horizontal target.

The Troyer multiplier for an elevated target is a straight 25% increase. Assuming that the shooter correctly accounts for the trajectory at the new angle, and can get in a comfortable shooting position, 45 degrees still increases the apparent vertical MOA based multiplier by closer to 50%.

If the goal is to use high angle shots to increase the reported Troyer, while not making the course too difficult, there is an advantage to using elevated targets, 15 or 20 degrees OK, but not if they are at 30+ degrees.

A lot of us seemed to have that first shot low problem with the first and second gen Impact's. It is from a couple of minor issues, including reg creep and stiction of the o-rings from sitting. Aside from cleaning, polishing, and lubing the reg components, I found that polishing the valve pins and bores, and the applying ptfe lube instead of clear silicone helped tremendously.

Interesting that most targets show more of a Vertical spread than horizontal ?
If shooting to fast perhaps the regulator is not keeping up yielding differing speeds shot to shot ?

Good fun right there as 280 shots is a nice picnic at the range !!