How does your CZ 455 Varmint 17hmr group? - RimfireCentral.com Forums

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Old 07-06-2016, 12:14 PM
Z400ACDC
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How does your CZ 455 Varmint 17hmr group?



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A friend wanted me to swap out his .22 barrel for a 17hmr. The rifle hot well with the 22 but the 17 is shooting groups between 1"-2" at 50. CZ wants him to send the rifle and 17 barrel in for a test. They said it should be under one inch at 50 and most are near .5. He did say the American shot better than the Varmint.
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Old 07-06-2016, 01:26 PM
bamajoey
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I did the same thing, replace a .22 barrel with a .17, and had the same results. The.22 will shoot .5 groups with good ammo at 50 yards, but the .17 was closer to an inch. I sent it back and they replaced it but I haven't been able to shoot it since I got it back.
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Old 07-08-2016, 02:27 PM
ajole
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My American came with the .17 barrel on it, and it groups under .5' at 50 with no issues.

There must be something wrong with the barrel, the system for holding it in, or how you installed it; and I don't know how you could do that wrong, its pretty simple.

Jut a question to the group...is there going to be an issue swapping the .22 mag based .17 HMR barrel into the .22LR gun, or vice versa...or should it "just work"?

At one point, in my mind, I THINK I MIGHT have read that it wasn't recommended to swap that way, you should only do .22 Mag and 17 HMR or .22LR and .17 mach 2...but I could easily be totally and completely wrong?
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Old 07-08-2016, 03:22 PM
wkd
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Have not switched bbls on my Varmints, but when I switched my American from 22lr to HMR I get 3/8 groups from Hornady 17 gr.
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Old 07-08-2016, 04:49 PM
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Csc57
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My 17hmr groups half inch at 100. My 22 mag barrel is about an inch at 50. I think the 22 would shoot better but I only have crap ammo. Sounds like a bad barrel, I wouldn't trade my 17 barrel for a Lilja
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Old 07-08-2016, 07:46 PM
DTS916
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Mr. Csc57...IMO, I don't think you will find any 22WMR ammo that will shoot better than good quality 17HMR. There just isn't any "Match" grade 22 mag ammo available these days and the best 22 mag rounds will not keep up with today's 17's. If your printing 1" groups with "crap" ammo I think you're doing pretty well and that will certainly improve with higher quality rounds ...IMHO.
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Old 07-09-2016, 05:56 AM
jaia
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is there going to be an issue swapping the .22 mag based .17 HMR barrel into the .22LR gun, or vice versa...or should it "just work"?


The 455 was designed to easily swap barrels/calibers.
The only caveat is that the barrel contour must match the stock.
If shooting 22lr, a pin and adapter is installed into the mag well
so the 22lr/17hm2 magazine aligns properly and stays put.
All this information is available in the owners manual.
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Old 07-09-2016, 06:08 AM
jaia
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Accuracy with the 17hmr can range from astounding to frustrating.
Factory barrels as delivered have been anywhere from satisfactory to horrid,
with a few being phenomenal. Ammunition quality varies cartridge by cartridge.
Anyone taking the time to test over a chronograph under optimum conditions
will confirm that there are no match grade 17 hmr ammo manufacturers.
Group sizes will range from 0.1's to 5 inches at 100 yards. Hot and weak rounds
will wreak havoc with target results. The 17hmr and 22wmr are hunting rounds.
They are not match grade target cartridges due to lack of quality control.

Last edited by jaia; 07-09-2016 at 06:13 AM.
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Old 07-09-2016, 02:14 PM
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First day out with it. Now it is pillar and glass bedded and the trigger reduced from 3.5 to 2lbs. I plan to get it out in a week or two and expect to see some improvement.
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Old 07-09-2016, 02:31 PM
dickw22
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Try different kinds of ammo. One brand shoots an inch at 50 yds. in my 17. Another will stay right around 1/4". I tried most every kind till I found which worked the best. There's pictures of ammo testing and other accuracy improvements I've made on the thread "My new project" right here on these hallowed pages. The last picture shows a group I shot last week in a match. I haven't measured it but it's probably under a 1/4" for five shots at 50 yds.
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