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(SOLVED) Vulcan Accuracy (Strange but True)

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Apr 2, 2015
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TX, United States
So I have had it till here with the Vulcan. It's a tack driver at long ranges but can't get it to group on paper. 30 yards IS a .5 inch group. 70 yards it spreads out to 1 to 1.5 inches. 160 yards is a 5-6 inch group on paper. 

BUT if I remove the paper and start shooting silhouette or plinking targets the gun transforms into a tack driver. Shot after shot hitting 2-3 inch targets bang on without a single miss all the way out to 160 yards. The same thing on paper at 160 is 5-6 inches. . (Go figure) 

Am using the 34 grain MK1 JSB and the 25 grain JSB. I have owned a condor, a hatsan, a bobcat, a cricket and now a Vulcan but I can't for the love of god figure out how a gun which I can shoot accurately at 160 yards at 2-3 inch metal targets doesn't group on paper. I have also tried shooting the Vulcan handheld at the metal targets at 160 yards. Even handheld I have managed to get 6 out of 9 shots on the metal target. This has never been possible with any of the guns I've owned before. 

I've tried the following: 

1. Cleaning the barrel 
2. Lubing and un lubed pellets 
3. Refocusing on my breathing 
4. Ensuring my trigger pull and follow through is good. (Never thought this was the problem but still tried it) 
5. Trying multiple holds- light, medium, hard 
6. Shooting with and without the mod in case there was any clipping (there isn't any)
7. Using a variety of sandbags 
8. Chronying my shots. The Gun fairly shoots consistently. 
9. Checked the barrel for imperfections. Inserted a cotton bud. There is no burring. Squeaky smooth and clean currently.
10. Triple checked my scope. No problem there. 
​11. Ensuring I am not canting the gun.
12. Finally Tuning the trigger. (I lightened it before but no changes in accuracy. Now I have further tuned it making it a hairline trigger. Will try the new setting this weekend to see if that helps)

If this also doesn't work then the only possible conclusion that I can draw is---

- My Vulcan hates paper. :) :) 

I am a guy who likes his groups tight. I can't hunt where I stay ...so grouping and plinking are the 2 options I have. I also know that if a gun can plink well at 160 yards it has to be accurate. 

If any of you have faced such a strange problem before and have managed to fix it; please do share your insights. 

thanks in advance guys. 
 
Why don't you place a paper target behind a metal target at 160 yards, aim for the metal target and see what groups do you get on the paper behind it? :)

Seriously...I am sure most of us would like to have your problem with such "poor" groupings at 160 yards! I do not have as much experience as most others here, but I would rule out the gun since it can hit reliably 2-3 inches at 160 yards. That leaves the shooter and the optics. Assuming the wind is not a factor. Let's assume the optics are fine (and there is no parallax issue...is there?). So, I wonder if you are using a different hold/aimpoint/cheek-weld/technique for paper targets vs plinking targets without noticing it? What scope mag are you shooting at? May be something to do with the sight-picture when aiming at a smaller paper target-dot bullseye vs a larger metal piece?

 
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"fe7565"Why don't you place a paper target behind a metal target at 160 yards, aim for the metal target and see what groups do you get on the paper behind it? :)

Assuming the wind is not a factor. Let's assume the optics are fine (and there is no parallax issue...is there?). So, I wonder if you are using a different hold/aimpoint/cheek-weld/technique for paper targets vs plinking targets without noticing it?
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My thoughts exactly! 
 
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LOL at the paper target behind metal target idea. That was funny. If push comes to shove, I will try this as well. :) 

Parallax isnt an issue. I have a zero eye relief scope. MTC Viper Connect. No eye releif so no parallax problem. My eye sticks to the scope all the time. This also ensures that my cheek rests at the same position. 

Aimpoint holdpoint I will relook at. But not sure if that's the cause. I don't lift my head while shooting given the Vulcan bolt. But yes I will switch between paper and metal targets on every shot the next time I shoot. This way, I'll eliminate the cheek weld as a potential problem. This is a good idea. 

Scope mag is always at 10x since the scope is true at that mag. 
 
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"Zephyr"What are you aiming at on paper - a dot, a cross, a circle? How are you aiming at it - centred, bracketing? I obviously can't be sure, but maybe it is something to do with how you are seeing the target. How about shooting at an actual size picture of your metal target.
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Aiming at a dot on the paper target. The reticle on my scope is the SCB 2 reticle. Very fine lines thereby giving me accurate aiming points. I have tried using the smaller half mil dot lines centred perfectly on 1 hole on the target to ensure my scope doesn't move. That hasn't helped much either. 

But will try the other option you suggested. Maybe it's just got to do with the target. I'll cut out similar shape paper targets so they look exactly like the metal targets and then check. Maybe it's just my eyes playing tricks when I swap between metal and paper targets. 
 
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To me i always seem To have This problem. I can be nailing Tiny things all day then you put it on paper and it goes ballistic (That doesnt happen as much as my vulcan But other guns). I think Ted even said something like that in one of his videos where he could keep nailing shot gun Shells at 100 yards But couldnt Group on paper.I dont know if This is any help But at least you now your not The Only one.
 
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"Pauly5"What if you put paper on the silhouettes. Would your groups be like on paper or metal? Is it the way your eyes see the colour, ie, white vs black? Just a thought.
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Could be I am growing old :) I swear I didn't have this problem a month back with the cricket. But it's Good to know that I ain't the only one. Will try the paper silhouette idea. Thanks. 
 
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"FastEddie"Try a higher magnification. My scope is set at 25x and making the target larger allows for more precise aiming. Having said that I also have days where my groups aren't as good as I'd like, but when it comes to plinking I hit every single one. ?? Strange .
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Strange is the predominant theme here. If I don't find a solution soon, I'm chalking this one up to Aliens. 
 
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So the other day, I discovered that my picatinny rail was loose. It had about 2 mm of play on it. The front screw on the rail was loose. Found that while I was cleaning my barrell. Torqued the screws and then Took the Vulcan out for a shoot. As luck would have ur the wind was howling and It was too windy to get any conclusive insights. Will have to wait till next weekend to figure this out. 
 
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"30cal"If the loose rail screw doesn't solve your "issue" then it is probably just your eyes playing tricks on you. Maybe try a few different paper targets to see if another style will work better for your eyes. Some targets are just hard for my eye to stay focused on. If you've eliminated all other factors what else could it be? Good luck!
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Thanks 30 cal. Will print out multiple targets this week and put it from 30 to 70 yards and then give this a shot. Will post my results next weekend. 
 
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Ok. Results below. This one is at 54 yards using the 34 grain JSB MK1. 9 shots 



And this one is at 30 yards using the 34 grain JSB. MK1. 9 shots 



I tightened the loose picatinny rail, adjusted the trigger for a lighter pull and turned the hammer Spring down by 1/4 turn. The pellet in the pic is. 25 grain pellet and not the MK1. I shot so many pellets today I ran out of the 34 grains. So used the 25 grains for sizing. 
I think it's shooting Preety awesome now. 

This is a video. (Forgive the audio pls) Shooting a matchstick at 30 yards. 



A big thanks to everyone for their inputs. I borrowed ideas from almost everyone here on how to improve my accuracy. The final test will be next weekend at 70 and 100 yards. 
 
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