CZ 17 Hornet Varmint: Gunsmith says to support barrel for accuracy - Page 2 - RimfireCentral.com Forums

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  #16  
Old 04-22-2019, 09:07 PM
Jgrizz

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Also what B23 is saying. Factory ammo isn’t always the best. Some guns shoot it better than others. And different lots of ammo will also shoot differently. I still think that gun should shoot better than that right out of the box.

If you have taken the gun apart or done anything to it, I would make sure everything is reassembled back to factory specs,
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  #17  
Old 05-01-2019, 09:03 AM
cowboy4
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Quote:
Originally Posted by carbonbased View Post
What say you? I thought sporter barrels often merit such support, but not varmint barrels. Although CZ 527 varmint barrels are not real heavy…
A quality, correctly and concentrically fitted barrel should not need the dampening effect of a pressure pad. That said some rifles whose groups are best described as “patterns” rather than groups will do better when dampened. I agree that sounds like a harmonic issue, the source of which might be the bedding of the receiver (allowing movement), the quality of the barrel’s steel, the bore’s path, or a combination of these and perhaps more factors.
Before I spent much on “fixing” anything I’d vet every component/factor:
scope/mounts, bore cleanliness/coppering condition, receiver bedding/screw torque, ammo quality (handloads), bag/rest set up, and (no offense) your technique on the bench.
None of the above cost much. Once they’ve been eliminated as possible source of your inaccuracy then it’s much more palatable to accept permanent changes to your rifle. If it were me and some pressure supplied by a few layers of business cards (near the tip of the fore end) doesn’t help, I would be much more inclined to look at a major change, ie...sell, trade, or rebarrel.

Good luck.

Last edited by cowboy4; 05-01-2019 at 09:06 AM.
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  #18  
Old 05-01-2019, 09:17 AM
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I had my CZ 527 in .17 Hornet out at the range yesterday. I had replied above saying that my first groups were horrible, and they were. But it turned out, in my case, to be a scope/ring problem. I swapped the scope and yesterday did this with Hornady 20 grain factory ammo at 100 yards:



The barrel is free floated to the action on this rifle. My "bad" groups were like the ones you reported. The above target doesn't "prove" anything with respect to your rifle, of course. But I was glad that I took another look at the scope issue before sending it back to CZ.

BTW: I think your rifle might be outside CZ's own accuracy standard. I had a .222 like that that had some gaps in the chamber metal and was shooting at over 2 inches at 100. I sent it back to CZ-USA and they replaced it with a rifle that can actually do well. Have you called them yet?

By "torque test" above I meant the action screws. You can go up in 5 inch/lb increments and see what the effect is on your groups.
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  #19  
Old 05-01-2019, 09:50 AM
carbonbased
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Well, I think the gunsmith is on to something, maybe it’s a crutch, heck I don’t know. The bottom two groups are warm-ups, and the top one my friend was trying. I don’t like the idea of he pad, but…
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  #20  
Old 05-01-2019, 10:21 AM
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Better! That three shot group labeled "Mike" is how I wish I shot all day long.

You know, my first centerfire rifle was a CZ 527 in .223 and it didn't start coming into its own until I had a certain number of rounds down the barrel. With a round count around a thousand now, the barrel looks like it was lapped.

[Lifting a glass of imaginary beverage] . . . here's to many more small groups.
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  #21  
Old 01-04-2020, 12:50 PM
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I know, free float them, then reattach them. This is all dreamed up by people looking to get your money.
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  #22  
Old 01-05-2020, 12:00 AM
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I recently started to shoot my 527 varmint 17HH with a factory threaded barrel. I sighted it in with hornady 20 gr factory rounds. It was shooting between 1 and 2". Then I started shooting reloads. 12 gr of 1680 with hornady 20 gr bullets were .5" 12.2 gr went to .56" 12.4 went .7" the faster It went the bigger the group's got. My next secession I am going to reduce loads a bit and test them.
The biggest issue with group testing is wind. Southern Idaho has wind every day.
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  #23  
Old 01-07-2020, 05:19 AM
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Give the bore a good clean and repeat the test using the same ladder steps but this time start at the 12.4 and come down.
I chased my tail when I first got my 527A. There appeared to be no rhyme or reason until I considered how few shots it took before precision dropped off. I'm seeing more copper than I expected and considering trying to re break the barrel in to see if I can get a layer of carbon between the steel and that screaming little pill of destruction.
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  #24  
Old 08-02-2020, 02:17 PM
carbonbased
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Well, I wasn’t happy with the barrel support solution, so my shop sent the gun back to CZ. We’ll see what happens.
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  #25  
Old 10-05-2020, 10:58 AM
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Mine didn’t shoot factory loads all that well. Hand loading resulted in .75moa 5 shot groups
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  #26  
Old 10-05-2020, 11:49 AM
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Originally Posted by Csafisher View Post
Mine didn’t shoot factory loads all that well. Hand loading resulted in .75moa 5 shot groups
Getting 3/4” groups using mass-produced equipment is pretty good.
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  #27  
Old 10-05-2020, 12:42 PM
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Only two of my 10 CZ527's have not pleased me when I first got them, first is a .204 that came to me used, they're known not to shoot 40gr Vmaxs very well and this one doesn't, just really haven't tried much else so far. My 6.5 Grendel was the other, 1 1/4" groups at 100 yards didn't warm my heart. Took it to my gunsmith and he said lets bed it as there's a lot of room around that action, a good bedding job did the trick. 1/2-3/4 inch groups with Black 123's is now the norm. I don't think needing bedding is a unusual thing with the 527's though only one of mine has had to have it to make me happy.
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  #28  
Old 10-13-2020, 01:53 AM
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I'm just starting to load for my CZ 17 Hornet, varmint barrel. I found that the Federal ammo shoots well in mine, not so much the Hornady Superformance. But I am interested in finding out more about the details on loading for this round. I use an RCBS Chargemaster 1500 for everything so far, except with these small loads I'm finding a .1 grain difference makes 60fps difference in speed in my 17 Hornet. And the Chargemaster has a load accuracy of +/- .1 grain.

I just got a more accurate scale to check the Chargemaster loads, and found my loads varied about +/- .07 grains, so possible .14 difference from loads what were supposedly the same! I think that is contributing to variations in my test loads, and larger and smaller groups with my tests.

So, I'm curious what method people are using in measuring the powder to create their test loads for their 17 Hornet? Or in producing accurate final ammo? Any help appreciated, on tweaking this load, making it more accurate.

Also, any primers seen to be better than others?

Factory Federal and Hornady
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  #29  
Old 10-13-2020, 11:47 AM
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Seating depth

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  #30  
Old 10-14-2020, 03:34 AM
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I'm trying to get my charge loads more consistent, then will tackle seating depth and primers as other options soon I'm hoping, before the winter hits and messes up further load development.

I'm curious what you found helpful in regards to seating depth, closer to lands or seated deeper? Have an OAL or base to ogive that worked best? Sounds like you have a CZ 527 also.

Also, so far powders I'm testing are CFE BLK and Accurate 1680 right now, and V-max 20's. Any particular loads you're finding your rifle favors? I've got some IMR 4227 and A2200, but not tried those as of yet, heard V110 and H4198 are other possible.
Thanks!
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