Am I missing something? Slug accuracy = terrible!

Sounds like a lot of people getting good results with the 20.2 nsa in their guns. Going to have to try these out. So far, I’ve had bad luck with anything except hybrids out of my old impact mk2 shooting them at about 960fps. I never got past 50yds to know if they opened up or not before selling the gun though. I’m gearing up to buy an evol 15”, and from what I hear, those nsa work well in that barrel too. I’ll try them, but it’s not a deal breaker for me if they don’t shoot. Most of my shooting is within 100yds anyway.
I have heard that the NSAs will work well, also the Howlers, and possibly the hybrids.
My 15" Evol .22 shoots the .22 RDMs better than my Impact did so don't overlook them.
 
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I've only just gotten hooked on air gunning a couple two / three years ago. Hooked. I've now got more than I need ( embarrassingly - 10 - yeah - lol ) and yeah - rabbit hole. Slugs - of those 10 guns - two shoot slugs pretty well. ( one very well actually ) My Taipan Vet Long (.22) absolutely loves .217 23g H&N's in the low 920's. The other one, and is the newest on in my collection is a 500mm .22 AGT Vulcan 3. It shoots .216 NSA 20.2's incredibly well @900fps. I'm currently shooting pellets in any of the other ones I have and have yet to find a slug in those guns that can match the pellets accuracy - not to mentions efficiency ( air usage ).

( re-reading this . . . . . ) Three - sorry guys. I also have an RTI (Prophet Performance) with a .177 barrel in it that shoots slugs ~amazingly~ well. I originally tried the JSB 13.43 KO's in it and they were *stupid* good at 980'ish fps. Curious about trying something a little heavier for more "oooomph" ( I do use them for pesting at farms ) I tried 16 and 18g's Griffin's. The 16's were horrible - shotgun city. The 18's on the other hand at . . . ( it's been a while ) low 900's I'm thinking shoot *very good* and they do pack a punch. They're a really soft lead and expand quite well.
 
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I've only just gotten hooked on air gunning a couple two / three years ago. Hooked. I've now got more than I need ( embarrassingly - 10 - yeah - lol ) and yeah - rabbit hole. Slugs - of those 10 guns - two shoot slugs pretty well. ( one very well actually ) My Taipan Vet Long (.22) absolutely loves .217 23g H&N's in the low 920's. The other one, and is the newest on in my collection is a 500mm .22 AGT Vulcan 3. It shoots .216 NSA 20.2's incredibly well @900fps. I'm currently shooting pellets in any of the other ones I have and have yet to find a slug in those guns that can match the pellets accuracy - not to mentions efficiency ( air usage ).

( re-reading this . . . . . ) Three - sorry guys. I also have an RTI (Prophet Performance) with a .177 barrel in it that shoots slugs ~amazingly~ well. I originally tried the JSB 13.43 KO's in it and they were *stupid* good at 980'ish fps. Curious about trying something a little heavier for more "oooomph" ( I do use them for pesting at farms ) I tried 16 and 18g's Griffin's. The 16's were horrible - shotgun city. The 18's on the other hand at . . . ( it's been a while ) low 900's I'm thinking shoot *very good* and they do pack a punch. They're a really soft lead and expand quite well.
Does your Taipan Vet Long have the factory barrel?
 
I finally jumped on the slug bandwagon and boy did I spend a lot of money for some terrible accuracy!

Can you validate if you're having the same experience? Or if I'm missing something, I'm happy to hear any suggestions.

Summary: After some pretty extensive testing, the best slug groups are 200% larger than my average pellet groups.
My benchmark target is at 75y. I can consistently get 1" groups at that distance with various pellets. On good days, 1/2" groups are common.
The very best slug performance I've been able to eek out is with the .22 .217 25g JSB Knockouts. Those groups are inconsistent and average 1.5-2".
The slugs that don't perform so well produce outright hysterical groups. Like 5" at 75y!

I understand slugs like higher velocities so I've focused most of my testing in the velocity ranges between 950-1050fps.
I've tried lubed and dry. I also tried several combinations of reg pressure, hammer spring tension, and valve travel limit on the FX rifles.

My objective: The local benchrest match has 3 classes (low power pellet, high power pellet, and high power slug). I'd like to find a slug setup to allow me to shoot the slug class competitively.

I dont think finding a reasonably accurate slug combo should be this hard (or this expensive). I'm on the ragged edge of giving up on this whole slug thing.

Thanks for sharing your thoughts.

Slugs I bought:
.30 50g Knockouts
.22 25g .216 cal Knockouts
.22 25g .217 cal Knockouts
.22 30g .217 cal HN
.22 23g .218 cal HN
.22 FX hybrids
.22 25g .217 ZAN
.22 30g .217 ZAN
.22 -> A couple varieties of Neilsen slugs

Rifles I tried:
FX Impact 22 (smooth twist, superior liner, superior heavy liner)
FX Impact 30 (smooth twist, superior liner, superior heavy liner)
Taipan Mutant 22 (CZ barrel)

Velocities tried:
850-1050fps
Only slugs I have tried out so far. Just about as accurate as my regular pellets; but they hit like a freight train aaaand my aim is way higher with these beefy 40gr beasts

Screenshot_20220827-165257_Outlook.jpg
 
It is rare to find an airgun that shoots slug well. In most instances they shoot much worse than pellets. I have 10 pellet guns and two slug guns. I've tried slugs in all of those pellet gun but found no success. Once you actually find a true "Slug gun" cherish it and NEVER let it go!
 
Without the thin skirt to expand out to the barrel it makes sense to me that slugs would be more sensitive to size than pellets. But we want pellet heads to also engage the rifling so maybe not. Maybe the greater rifling engagement with slugs makes it important that the size be just big enough to fully engage the rifling but no larger than that.

I have done the same sort of hap-hazard investigation of slugs that others report. I tried several in my 25 Avenger and none shot well. My P35-25 and P35-22 shot a heavy Slug-HP well (the 25 was tried in the Avenger first and it didn't like them). But both guns shoot pellets better. But I just shot the slugs at the speed they went using the same tune I was shooting pellets at. Because of the weight difference the slugs in both cases weren't going even 800 fps. I tried lighter ones but they shot poorly. So I would need to mess with the tune to see how they would do at higher velocity and I have not been motivated to do this. I want my pellet guns to knock down squirrels when I can find them. Shots are never more than 50 yards and are mostly 25-30 yards. Pellets work well. So until I think the slugs will do something better that I want to do, they will probably stay on the shelf.

Knowing our twist rate would probably tell us if slugs have a chance to work and knowing our exact bore size would likely help decide which to try. I think slugs need a twist of 1 in 18 or faster. 1 in 20 something seems to work great for pellets but not slugs.
 
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Here at N50 we had a great deal of hope for the airgun slugs in real benchrest competition. So much so that we created a special "Class" for factory slug guns. Sportsman class. This class also permits 22LR to compete side by side with the expectation there would be good competition between the two. Also allowed are Pellet guns shooting "up" in class. There are a few pellet guns hanging in there. See the Sportsman scores https://www.national50.net/results
Unfortunately, no one came to play - except one slug shooter. We are looking forward to the day slugs become competitive and we hope that is soon.

https://www.national50.net/rules

Sportsman Slug Rifle Requirements​

Factory rifles.
Slug: Any commercial cylindrical slug design, in .177, .22, .25 and .30 caliber
Barrel: Factory only.
FPE: Maximum 100 foot-pounds of energy.
Air Tanks: Tethered air tanks are allowed but tank must be secured. Tethered tanks are not allowed on top of benches.
Note: Sportsman Slug Rifle is scored with the .350 plug head.
 
The 2022 I dedicated to shooting .25 slugs.
BUT, this last weekend I re-tuned my .25 Impact back to pellets to finish my season at least with a :) .


Wow, no-one can say we haven't had a fair warning.... 🤨


I'm wondering if I really want to go on down that rabbit hole — or just get a stockpile of MRD's and leave "good enough" alone.... 🤔

Matthias
 
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I am shooting 80% a 100 Meters distance and only maybe 20% the 50M. The 2022 I dedicated to shooting .25 slugs.
I cannot say I wasted my time shooting slugs the entire year - it was still a valuable learning curve.
But, this last weekend I re-tuned my .25 Impact back to pellets to finish my season at least with a :) .
Gotta love those 33.95’s. Takes about 10-15 minutes to find your settings and then match or beat almost every slug group you ever fired out to 100 yards. Wake up tomorrow and your gun will do it again.
 
Matthias, it all depends on your standards. My standard is if a slug won’t outperform a pellet at EVERY distance, your wasting your time. Just shoot a pellet and you’ll never feel like chewing nails. Shooting an airgun is hard enough without having to make windage and elevation adjustments for something that’s kinda accurate and kinda consistent. That’s why I said what I said in post #16. We don’t know what everyone’s standards are so a good shooting gun to one guy might be laughable to another guy. I’m with Centercut when it comes to my 50 yard groups. They have to be under a dime or less before I move out any further. When I move to 75 the tweaking begins again and sometimes it ends right there and it’s back to 30 yards. I spend days or a week at a certain distance before I move out. If the gun isn’t spot on at 50 every time I grab the gun it will certainly only be worse at 80-100. When I got done with a high hopes build recently, I stalled out at 75 yards. Not because the gun wasn’t accurate or consistent. I was gunshy. Too chicken to push to 100 and the work that may follow. Just burnt out I guess. One night Bigragu kept egging me on so I just said F it and went for it. It was good but I thought there still might be little left to squeeze out of it. I guess he lit a fire under me and got me motivated and I got it to where I was covering my groups, all groups with a quarter. When I shoot at whatever distance, I shoot 5 groups. I measure them all then average them out. Just because a gun shoots 2 out of 5 groups at just under an inch does not make it a MOA gun. A cherry picked MOA gun yes. The true average over a weeks time tells you what kind of gun you really have. Most, because of fliers, don’t have as accurate of a gun as they depict.
Much truth there, and a great reality check.
 
There is some great advice on these three pages from some of the best shooters and tuners on the forums!

One thing that I did not read, and does have a very important role in the group size, is the fact that all of those barrels that you tested have chokes. In the past I have read that other's with a 600mm FX setup would buy a 700mm FX barrel and lop off the end and re-crown it. Other's would simply buy an un-choked barrel liner and have it machined to fit. All would come to report great success. I'd try getting a 700mm FX liner and cutting it off square at 600mm and re-crowning it.
 
...Other's would simply buy an un-choked barrel liner and have it machined to fit. ...
The choke is one element only that effects for what projectile it will decide, the second important is the rifling twist rate.
I have 3 liners in .25 more or less choke and faster or slower twist rate, and the tunes are pretty much different.
Then you finally decide and tune your gun, go to your range and the wind gets into your mind. Very funny.........
Nah, pellets are drag stabilized, tuning within one mag in less then fifteen minutes, and need much less cleaning the barrel, and I can resize.
 
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Coming from the PB side as a reloader and caster, I can say we spend a great deal of time on load development. A lot of the same principles apply to shooting slugs in air rifles. Every barrel is different but we can get close by seeing what works for others using the same rigs we are. After that, it's up to you to do the work and figure out the details that give you the best accuracy. There are too many variables to list, but slug weight, size, velocity, and barrel twist must be considered if you are chasing tiny groups.
 
I have an M3 Sniper in 30 cal as well as an M3 Compact in 22 cal and both shoot the FX Hybrids incredibly well. I dual tune. On my 22 M3 Compact, with the power wheel on 16, I have it tuned to shoot the 22gr FX Hybrids at 960fps. Then I turn the power wheel down to 6 and it shoots my Hades pellets at the same speed with no difference in POI at ranges of 30 yards on my property. I only have the barrels that they came with.
On the .22 Could I ask what you have your front valve set too and are you on the pellet or slug port? What are your front and rear regs set too. I only ask as I have my .22 set for Hades and its shooting at 956fps but have the Hybrids and looking a tune that will reliably shoot both