Suggestions for a fun semi pcp to take the place of powder burner plinking?

You just named two of the higher powered guns. The SK-19 is partly made and assembled in the USA so a plus for those of us that live here. One inch groups at 75 yards with the right ammo and not to pellet fussy. Mine came with a messed up barrel but it shot nearly the same as the new barrel they put on it under warranty. Make sure to order from someone that has one in stock or you will likely be waiting weeks.
 
A rifle I was thinking of is the Evanix Air Speed, which comes in .22, .25 and .30, semi-auto and from researching seems to be very accurate as long as you keep it stock and not try to modify the internals. It is a nice looking design with a long built in air tube that provides a good amount of shots.

After some thought and not wanting to get too large of a collection, I am going to get the FX Impact MK2 in .357; buy at least one complete barrel, probably a .25 and also add the Saber Tactical pump action. That way I can get fast rapid fire with the pump action in both small caliber as well as with .357 all in one gun, although an expensive setup but can help limit the space in the house. 
 
I don't like recommending Chinese manufacturers....but besides one youtuber, I haven't heard any bad things about the AEA Terminator. It comes in .22 up to .45 and is a 7 shot semi automatic. I would like to hear more reviews on that gun since it's a $1000 delivered. 

And have you checked out the Styer LP50 HP. It's a 5 shot semi automatic pistol in .177. Very expensive but it seems to be the favorite pcp gun of everyone that owns one.

AEA also has a semi automatic pistol in .22 called the SS. It's less than a quarter of the price of the Styer at $400 delivered it may be worth taking a chance on. Out of all the guns out there, the SS is specifically the one I would like to hear more reviews on, since I am seriously considering the Styer and would like to be talked out of buying one. 

Evanix has some neat semi autos as well as full auto, in big bore too. A real fun gun is the Evanix Max electric semi/ full auto in an array of sizes, up to a .50. It's a bullpup and Nate from airgun channel has them for sale in .357 with a full auto switch if that's your thing. 

I got the Max ML in .357. They are shrouded with a threaded end so if you wish to make it quieter by adding a can, you can. 

Hope this helps since it was only 3 months ago I was asking the same question..... $3500 later and I still have to buy a tank, lol.
 
Huben all the way!! I have purchased and sold to Friends and Family 7 Hubens in 2019-2020 and in the process of purchasing 8 more. They are accurate, extremely quiet for the power they produce, adjustable power on the fly, very nice trigger for semi auto. You can shoot pellets or slugs. Great support and customer service from Kelley @ Kraz Cool Air Guns. I have sold all my other pcp's except for a Career 707. The Huben is built extremely well and not hard to service. I have owned Styers, Fx Monsoons, and been around the Evanix Air speed. No comparison against the Huben. I am not a sales person for Huben just really like there product.

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Huben all the way for me. I own two now. Just got back from a pesting session and had a blast. I owned an Air Speed and it was OK but the Huben is on a whole nother level. Shot a Steyr and its a great gun but 5 shot capacity sucks. Shot and worked on a few Monsoons but never cared for the design.. very temperamental. Never shot an SK-19 but its basically a redesigned Huben. Bigger and heavier and longer with full auto option. I fell in love with the Hubens and thats all I own now. They do everything I need an airgun to do. It seems like it just keeps getting better and more accurate the more I shoot it.


 
Huben all the way for me. I own two now. Just got back from a pesting session and had a blast. I owned an Air Speed and it was OK but the Huben is on a whole nother level. Shot a Steyr and its a great gun but 5 shot capacity sucks. Shot and worked on a few Monsoons but never cared for the design.. very temperamental. Never shot an SK-19 but its basically a redesigned Huben. Bigger and heavier and longer with full auto option. I fell in love with the Hubens and thats all I own now. They do everything I need an airgun to do. It seems like it just keeps getting better and more accurate the more I shoot it.


Do all semi auto Hubens have non-removable magazines?
 
Yes the mag is non removable on it and the SK-19 but after you use it for a while its not an issue. Works pretty slick and simple to load. Some guys say their dangerous because of design. Its no more dangerous than any other gun. Just use common sense. I just rotate the mag to an empty hole before putting away, if there's any pellets left in mag that is.

Power is way more adjustable than most guns and has external reg adjustment. Trigger can be adjusted to be very good. 
 
A little back ground for me. 

I'm trying to upgrade from the Sig Virtus PCP .22. which has 30 round belts that feed into magazines. I have 7 belts and can swap a belt in 10 seconds. A single tank charge last 150 solid shots. Those are the positives about the gun and it suits my very fast plinking style well.

The problem with the gun is pretty much everything else about it which is pushing me to find a much higher quality semi auto. I'm willing to give up shots per fill, but the lack of removable magazines is very hard for me to live with giving the way I use the gun.

I like to shoot about 1000 rounds a week as a stress reliever. I set up a 10 yard shooting gallery in my basement.


https://www.youtube.com/watch?v=3iXyRHaJGfQ


 
What about the Hatsan Blitz? Auto and semi auto. The sigs are very low end in comparison to what you are looking to graduate to and the great bulk of high end rifles will actually be more like powder burners in the sense that it takes more time to load mags (though not any more time than it would take to load a powder mag). I have a Sig myself as an indoor plinker. They have their place but there is no comparison to $1000-$2000 rifles. The Sig is a toy in comparison. But a fun toy. If you are ok with a longer length of pull, you can easily convert the Sig MPX/MCX to HPA. Also, the higher end rifles are going to pack quite a punch as compared to the Sig so make sure your backstop can handle the much higher FPS.
 
I've considered the Blitz multiple times but can't get past how long it is. It's a solid foot longer than I want. So then I looked at the Bullmaster and it's reviews aren't great and it weighs over 10lbs without a scope. Plus at $900 I'm getting close to premium gun prices.

As for converting the. 177 Sigs to HPA, I've read they don't perform as well since they are valved for CO2 and Im not looking for another headache. Also, I'd like my next gun to be a lot more accurate than these Sigs are.

You mentioned you have my same Sig Virtus. How many rounds have you put through it. I'm nearing 9,000 and it broken for the 2nd time. First time was in the first 500rds. Stopped firing and had to mail it to Sig. About 8000rds later and the same thing just happened again. Also, my Virtus has some horrible accuracy issues. The barrel moves inside the shroud and the picatinny rail that holds the scope is not solidly mounted. It truly is a toy and want a real air gun.

As for these nicer guns having higher FPS, that is part of the reason I like the Evanix. Has the easy to adjust power dial. I just need customer service incase something goes wrong and there appears to be none.
 
I don’t disagree with any of that. I have the Sig MPX. It’s fun for what it is. I don’t have the round count you have. In my opinion it is a toy plinker. You just aren’t going to get the quality out of it that you will get with a premium PCP rifle. Same with pretty much all the co2 pistols out there, including the Sig line. If you have real Sig powder pistols, the co2 pellet sigs are toys but at least replicate the feel of their corresponding powder brethren. 

Getting back to rifles, I have a Leshiy and the new semi Leshiy 2 is probably what you are looking for. Extremely compact. High quality. But expensive. You are going to need a good budget to accomplish your objective because you will also want a good red dot. If you are more wanting to practice dry firing to enhance your powder proficiency, I would suggest going airsoft gas blowback. The premium airsoft pistols and rifles are a lot less expensive ($200-$500 in most cases - you can of course spend more) and many function like a powder burner. I’m frustrated that co2 pellet pistols seem to have fallen far behind airsoft in terms of functionality and replica feel. Finally, although bulky and nowhere near replica feel or functionality, some of the PCP pistols are nonetheless getting more advanced in terms of accuracy, so they are also a lot of fun. Some are also very expensive but others like the Artemis PP700, 750 and 800 are very inexpensive and IMO great value for those on a budget.