My First PCP

I'm from Europe and we have a 20J limit if I remember correctly but I also have a firearms licence. I wanted it this way so if i decide to sell it I can sell it to anyone as long as they are older than 18. 
My is a .22 and I definitely need some kind of suppressor. I already ordered the adapter I'm just not sure what to put on the end of it. I've read that Weihrauch makes quite decent one > (https://www.krale-schietsport.nl/en/silencer-weihrauch-1-2-unf-6234.html)
I already checked the videos thanks for the heads up. As for the Shooting the Breeze, I gave it a quick look and it seems that there is a lot of useful information.
 
As promised I tried a couple of pellets I had at 75 yards. The results aren't what I expected.
There was no wind, I had my rifle rested on an Atlas in the front and a sandbag in the rear. All the pellets shot were visually inspected for bent skirts and obvious defects. The barrel was thoroughly cleaned beforehand. 
All the targets should have 5 holes but some don't. The last on with the JSB Express should be a 10 shot group.



 
I have the best luck with the JSB 18.1 in my .22 Cricket and it looks like that's the one that might have the best potential in your Steyr. 
The only thing I can tell you is barrel cleanliness can be a problem with the Steyr. On the silver barrels, at least, some of the nickel plating makes it into the bore and can cause problems. If yours were my gun I'd give it a really good scrubbing with a brass or bronze brush on a rod.
Here in the states we can crank up the velocity on heavier pellets to get those small long distance groups. Your ES and SD are really good over 159!! shots, so that's not a problem. Were these shot at 15 fpe still? A lot of people shoot for 870-900 fps for best accuracy.
 
I'll give it a good scrub to see if it changes anything.
I have the rifle shooting 15.89gr JSB Jumbos at 820 fps but I didn't have a chrony to test the pellets I had with me. I'm waiting for some other JSB pellets with different head sizes to see if I can tighten things up a bit. For now my springer in .177 with pellets straight from the tin and shooting from a backpack can do better than this and to be honest I'm a bit worried.
 
"AJ"Nice gun and you will need to bump the power up in order to get better groups at long range.
Weighing and sizing your pellets will most definitely help your long distance accuracy as well.
AJ
I'll definitely experiment with the power settings a lot more to find the sweet spot. 
I'd like to try some different head sizes first to see what it eats up best and then get a correct TbT pellet sizer.
 
Try shooting Crosman Premiers if you plan on shooting on low power. I think you will get better groups at long distance shooting Crosman brand pellets. They are the ones in the Brown Box if you can find them, otherwise try the 14.3gr Crosman pointed which come in tins of 175. If you can find the pointed pellets with the Copperhead label which are older stock, they work the best. Also try Webley Powa Pells and Accu Pells made by Crosman. Crosman pellets seem to work extremely well in my lower to mid powered guns in general in both spring and PCP platforms.
AJ 
 
Yes the Brown Boxed Crosman Premiers have 625 in each box and they are no longer being produced so if your gun likes them I would suggest you buy them all immediately. Alternatively there are cheaper Crosman Premiers in the tins of 500 which you will absolutely need to weigh and size each and every one before shooting them if you want good long distance groups.

I have personally had good results with *WHEN WEIGHED AND SIZED*-
CROSMAN
Premier Brown Box A+
Premier 500ct tins A-
Premier Hollow Point Domes A
Benjamin Sheridan Domes A+
Discovery PCP Domes A-
Discovery Hollow Point Domes A
Pointed 175ct tins A
Copperhead pointed A+
Webley Accu Pell A+
Webley Powa Pell A+

H&N
Barracuda A
Barracuda Match 5.52 A+
Field Target Trophy 5.53 A- 5.54 A+ 5.55 A

Had better results from Air Arms and EDGun labeled JSBs
in both 15.9 and 18gr in general in 22 caliber. The JSBs can
be excellent as well but only if they come from a good batch
or if they are the old labels and are not damaged in shipping.

AJ
 
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If your barrel leads up it will really shoot bad but it takes a real tight patch to get it out. I have a FX 500 and a FX Boss and i have to clean them often . Never really counted shots but maybe every 300 shots but that is a quess. I use a Crownsaver pull through and tight patch with a little NP 10 on it. Both have been polished and that helped with leading up and accuracy. My Mrod is 22 cal and Jim Gaska hammerforged barrel. I dont lube pellets because it shoots better not lubed but leads up in 100 to 125 shots. Leading up could be your problem. It takes a tight patch to get it out. If it is a lead problem polishing the barrel will help. How does it shoot at 50 yards? I would think 860 to 890 fps would be a good speed for the 18.39 JSBs.
 
"AJ"Yes the Brown Boxed Crosman Premiers have 625 in each box and they are no longer being produced so if your gun likes them I would suggest you buy them all immediately. Alternatively there are cheaper Crosman Premiers in the tins of 500 which you will absolutely need to weigh and size each and every one before shooting them if you want good long distance groups.

I have personally had good results with *WHEN WEIGHED AND SIZED*-
CROSMAN
Premier Brown Box A+
Premier 500ct tins A-
Premier Hollow Point Domes A
Benjamin Sheridan Domes A+
Discovery PCP Domes A-
Discovery Hollow Point Domes A
Pointed 175ct tins A
Copperhead pointed A+
Webley Accu Pell A+
Webley Powa Pell A+

H&N
Barracuda A
Barracuda Match 5.52 A+
Field Target Trophy 5.53 A- 5.54 A+ 5.55 A

Had better results from Air Arms and EDGun labeled JSBs
in both 15.9 and 18gr in general in 22 caliber. The JSBs can
be excellent as well but only if they come from a good batch
or if they are the old labels and are not damaged in shipping.

AJ
I called the store that had them and they are all gone. Even If they had them I would only be postponing the search for a better pellet since they are not produced anymore. 
How do you size your pellets AJ?
As for the H&N nobody has anything in stock (at least not in 5,5) and I'd have to wait up to two months, but everyone has Gamo and RWS. Sometimes I feel like I'm living in Siberia. I ordered them from Krale since I've heard a lot of good things about them.

 
"Scalf"If your barrel leads up it will really shoot bad but it takes a real tight patch to get it out. I have a FX 500 and a FX Boss and i have to clean them often . Never really counted shots but maybe every 300 shots but that is a quess. I use a Crownsaver pull through and tight patch with a little NP 10 on it. Both have been polished and that helped with leading up and accuracy. My Mrod is 22 cal and Jim Gaska hammerforged barrel. I dont lube pellets because it shoots better not lubed but leads up in 100 to 125 shots. Leading up could be your problem. It takes a tight patch to get it out. If it is a lead problem polishing the barrel will help. How does it shoot at 50 yards? I would think 860 to 890 fps would be a good speed for the 18.39 JSBs.
I've given the barrel a good cleaning with the brass and a nylon brush like you suggested. Then I ran patches though until the they didn't have any traces of lead on them. Whilst the barrel was already out I decided to try pushing a pellet through with the cleaning rod.
As soon as the skirt enters the barrel there is very very little resistance on the pellet (JSB Jumbo Heavy 5,52) all the way up to the last 5 cm where it becomes really tight. After I pushed 7 pellets thought I pulled a dry patch through and they seemed quite dirty for the number of pellets that went though. Here's a couple of pics of the pellets and patches in the order that they were pushed and pulled through:
I've read that some Steyrs like lubed pellets so I ordered some lube to give it a go.
Didn't have the chance to try if there is a difference today. Hopefully I can give it a go tomorrow.
 
"I" do not like rifling that deep, again ( just me) I think these deep marks alone grab too much air and drop off in accuracy fast as distanc increases. I have seen several older 16mm LW barrels - not that that is what you have- that were as you say loose then quit tight but many had DEEP rifling which shot lights out one hole groups at 10M, 25m not really so good at 50 and no way any "groups" at 100.
Polish?

John
 
I think at this point i would see about returning the gun and getting a replacement. If it needed a little improving i might polish the barrel but it needs a lot of improving. Polishing the barrels on my fx 500 and Boss helped accuracy but not a lot. It really sucks to get an air rifle that doesn't shoot like it should. I got a RAW 25 cal that didn't shoot to suit me but couldn't get Martin to do anything to it so i sent it to AZ to make it a 30 cal. I bet it shoots good when i get it back because AZ will really test the gun and make adjustments as needed before he sends it to me.