CZ 17 HMR varmint accuracy issues...HELP PLEASE!!!

I have the above rifle, it is shortened, suppressed, bedded and normally an absolute tack driver with hornady 17gr ammo, it does copper foul and the accuracy starts to drop off after 100 or so rounds.

I recently lent it to a mate with a rabbit problem, I also gave him a rod with patches and boretech eliminator, hoping he would occasionally clean it!

He called me recently and said the gun wouldn't shoot, I picked it up and gave it a really good clean, the best I could get it to shoot was about 2" at 50 yards!

I stripped it completely and thoroughly checked and cleaned everything again, I re shot it and even tried the 20gr ammo that it didn't like years ago when I tried all sorts of ammo to find out what it liked, no joy, it is still only shooting about 1.5" at 50 yards.

It has a vx3 4.5-14 on it and Burris z rings on a piccatinny rail, everything is solid.

The only thing I haven't done is shoot it without the suppressor.

HAS ANYBODY GOT ANY IDEAS WHY IT WONT SHOOT????

It was normally a 1/2MOA gun and I could shoot inside 30cal bullet holes at 100 yards when mates would sight guns in.

Normally they lose accuracy when dirty, I only clean my barrel when it needs it or I'm bored, have owned the CZ but didn't like it so sold it and bought an Anshultz, always dead accurate, sold that for @BRADS Sako just been out this avo and shot 3 rabbits all at about 120-150, one shot kills. Unless mechanical damage I'd say cleaning is the prob, I use a bore snake on mine,

What does the bore look like?
Tried a different scope?
Is the stock not cracked warped loose screws etc?

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VC it's a 17 Hmr ! You just shoot em broken stock buggered barrel under water! They're just accurate all the time!:ORLY:t

Checked the barrel crown? Corrosion from leaving the suppressor on for long periods?

Crown is perfect, stock screws tight and even, barrel floating, I haven't tried another scope, I guess that is the next step although I don't think that will be it. I would love to have a bore scope.
My mate only put 4 boxes of ammo through it. I cleaned it with a brush and patches using eliminator and it was copper free as far as I could tell before I shot it yesterday.
Any idea how many rounds these rifles are good for?

Suppressor left on is not good but doesn't seem to corrode them, 17 hornet corrodes overnight?

1000s in my experience @Happy has just worn one out and he's nearly bankrupt buying all the ammo he's put thru it

Check the scope hasn't got an internal prob, take it off or put it in a benchvice to check its accuracy

Try without suppressor before changing scope. A very Dirty or damaged suppressor can certainly effect accuracy.

Or I'll give you $100.00 for it:thumbsup: Iv never had to clean any of my suppressors but could be or something loose, out of alignment in side,

Cool, thanks guys, I will try without suppressor and then try another scope, only spare I have is a 5-25 ATACR, should be ok for a .17 ��

I have put over 5 k rounds through mine
If it goes off its either dirty or has fucked the suppresser
It's had probably four of them so far all cheapish though

Mine Has VX 3 very expensive rings
It's had trigger and all sorts of shit done to it and shots 3 in one hole every time the wind behaves

As above when it starts to go off it gets a massive clean then if that don't work a new suppresser does
I m gonna try a DPT next time

Anyone know what it would cost to rebarrel?

Sweet, hopefully only a suppressor problem, will take it off on Monday and try it.

@Happys looking for a new one! Hahahahaha unless it's been badly damaged the barrel won't be worn, as happy says 5ks worth I've done over 1 k thru 2 of mine

@Happy is yours a CZ varmint? what ammo does yours like?

I think bore scoping your barrel would be the next step after checking the scope. If you don't know somebody with a borescope that small( not all of them fit into a .17 barrel) maybe send it to grant at true flite.he probably would have the right borescope . He does a rifle check up for $30, and in certain cases like yours where all the avenues seems to have been looked at, it could be money well spent. Think how much more money you are going to have to spend in ammo, testing, cleaning, gunsmithing visits till you get somebody with a borescope who can analyse the problem properly and all the money you already spent since problem occurred.
As a side note, I have a 17 hmr match reamer that I could lend to grant if you were deciding to get him to push back the barrel and rechamber or if you where getting a new barrel fitted. If your rifle is the 455, then just buy another new barrel. It would be more economical.

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Originally Posted by robh500

@Happy is yours a CZ varmint? what ammo does yours like?

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Mine is Marilin. It loves the Heavier grain in Ballistic red tip Ss heavy barrel

I have a CZ in 17 Hornet as well and that's wicked as
Gets more use than the HMR these days. Cuts your rabbits in half though.

Thanks heaps for all the info guys @Friwi if I exhaust all other avenues then I might send it to grant and could be keen on the use of your reamer, hopefully it's not needed!

Just for info, it is a 452, I'm not sure what the difference is between that and the 455.
All I know is that in a very short period of time it has gone from a lazer to a shotgun!

I have a really nice Savage that went from Lazer to shotgun. Fouling was the problem in the end. Boresnake and a light scrub just wasnt enough. Hoppes and a huge scrub of bore and repeat was the trick. Being good ever since and fouling less now.....maybe your bore cleaner just isnt doing the job.

My 2c could be from over enthusatic cleaning, rod may have damaged the muzzle crown. Only takes a slight imperfection to bugger a tiny hole like that. Re crowning may be an option before throwing even larger wads of cash at it.

I am going to guess at a carbon ring, these can be hard to remove,
I have a 452, .17 HRM, and after a prolonged period of use, accuracy dropped of, a soak with foaming bore cleaner, and a clean with a bronze brush, a few times, Had to do this twice, it came back to normal.
what and how are you cleaning it, cleaning rod or pull threw, type of cleaner, and brush.
Damaged crown as already stated, a scope that's failed, a bad batch of ammo, yep I have struck this with the HMR, try another batch or weight to confirm.
stock cracked in the tounge, or over tight or loose screws.

lend your wife or lawnmower and it will come back fuckd . .. and rifles

its prity hard to stuff a gun but somehow friends can manage to do it . . . been there, now i have lenders that i don't care about.

last one was a .22 that came back with a damaged crown, sometimes its better if they don't clean them - before that was bent mag lips and it wouldn't feed . . . if nothings broken i consider myself lucky.

lent out my cz 455 in 22lr and it came back with my mates 30cal bronze brush jammed up the chamber... he tried to clean it for me!

Just pulled the suppressor apart, no issues there :-(

Can you get a sighting cradle to clamp it into? That will sort if it's the barrel, you have fired it without the suppressor? Check the crown, I have a Brno mod 2 .22 and that would throw flyers, a re crown fixed it. It's Gotta be simple

Fuck Rob, do any of your rifles shoot Blahahahaha

You know what the main problem is, You lent someone your bang sick Never lend people your gear always comes back half rooted or not at all :XD:


Ive got a CZ 453 in 17hmr & that thing is a farken tack driver, theres some good advice on here so hope you get it sorted bro

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Originally Posted by 223nut

lent out my cz 455 in 22lr and it came back with my mates 30cal bronze brush jammed up the chamber... he tried to clean it for me!

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Fuk me thats classic :o Like Ive said "just don't lend out ya gear"

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Originally Posted by viper

I have a really nice Savage that went from Lazer to shotgun. Fouling was the problem in the end. Boresnake and a light scrub just wasnt enough. Hoppes and a huge scrub of bore and repeat was the trick. Being good ever since and fouling less now.....maybe your bore cleaner just isnt doing the job.

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Could be serious copper fouling... Have you tried something like JB bore paste?
I had a 452 and it was a bastard to clean as the bore was super tight.... I got some of the Bore paste and she came right again.

Hope that helps.

Have you looked to see if he's dinged or knocked the suppressor and bent it?
I bought my Marlin HMR and the previous owner said it wouldn't shoot groups. Turns out the bullets were clipping the exit hole on the suppressor on the way out.
New suppressor and a clean. IT is awesome.