CZ 457
- Thread starter A-Rob
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I was told or heard somewhere that longer barrels are easier to tune? Has anyone tried to tune 20" Lilja that were all buying? If not what speed does it like?
Griffons minimalist brake, it never gets shot unsuppressed, just a way to mount to the can
Edit: just looked at my own picture, didn’t realize I had the can on for the picture lol my bad. It’s a griffon optimus micro. I love it, there are smaller and lighter dedicated 22 cans, but I use it for my 224v often so it’s nice being able to put it on that also.
Seems to like Eley Match (black box) the best. The lot I have is 1075 FPS. At closer ranges (25-50 yds) the SK Rifle match performs almost as well. The SK has more vertical flyers the further out you go. I had to shim the barrel for a slight crush on the SK or the Eley wouldn’t extract all the time. It also made everything shoot tighter.
Random question.
Has anyone taken and stoned the bottom of the bolt to get rid of the engraved numbers to see if it smooths up the action?
Winter time tinkering. I love the 457 and all the improvements but I still think it’s not as smooth as the 452/455 actions because of this.
It doesn’t impact how the gun shoots or cycles really, just a little pet peeve.
Has anyone taken and stoned the bottom of the bolt to get rid of the engraved numbers to see if it smooths up the action?
Winter time tinkering. I love the 457 and all the improvements but I still think it’s not as smooth as the 452/455 actions because of this.
It doesn’t impact how the gun shoots or cycles really, just a little pet peeve.
I used a white ceramic stone to take the rough edges off the s/n on a couple of my 457 bolts, but there's no need to go so far as to remove them. All it takes is a little light stoning to smooth the rough edges of those numbers.
I know my bad. I'm set at .003. Just got 5 speeds each of 10x and Match waiting for a day to chro them. They shoot faster in that barrel!
How bout bolt guide, thats why its stoned down. Mine was rough when I got it.
Stoned mine down and it did smooth up the action - not a lot, but some. Only took about 2 minutes. The more I shoot, the smoother it gets. Love the silky feel.
Hey guys,
I’m trying to pick out a scope for my 457 w/krg bravo. I’ve got a bscar 15moa rail on it. I’m horrible at math and can’t seem to confirm if a 50mm objective would fit or not. I’m looking at the Arken Gen2 4-16x50 combo which includes choice of rings (0.92/1.26/1.49). The bscar adds roughly 1/4” but even with the tall rings it doesn’t add up to 50mm… am I missing something? It’s a 34mm tube, can someone help a brother out?
I’m trying to pick out a scope for my 457 w/krg bravo. I’ve got a bscar 15moa rail on it. I’m horrible at math and can’t seem to confirm if a 50mm objective would fit or not. I’m looking at the Arken Gen2 4-16x50 combo which includes choice of rings (0.92/1.26/1.49). The bscar adds roughly 1/4” but even with the tall rings it doesn’t add up to 50mm… am I missing something? It’s a 34mm tube, can someone help a brother out?
FWIW, I have the same BScar rail and am running an Athlon Helos 8-34x56 on Vortex med rings (1.06") and have a little over 1/16" clearance with the scope snap covers on. With a 50mm objective, the 0.92 rings will probably work, but it will likely be really close. Kinda depends on the actual OD of the lens. You may want to check with Arken and get the "exact" OD of the lens. You can set a straight edge on top of the rail and measure down to the barrel. Add that to the ring height and the total is the centerline of the scope. Subtract half the objective lens diameter and that will give you the clearance. Hope that makes sense to you.
Remember this: the objective diameter spec is the diameter of the lens itself. Add roughly 2mm for the thickness of the bell. Then divide that total by 2, so in this example, you get (50+2)/2=26mm.
Add the total from above
- the distance from the top of the rail to the center of the rings/scope tube (in mm)
- rail height over barrel (in mm).
——————————————————
= clearance over barrel assuming a straight cylinder barrel. Tapered barrels will allow for more clearance.
Thanks guys, I couldn’t find the actual overall dimensions on the new gen 2 and was starting to confuse myself. Sounds like the medium rings should work. Much appreciated.
Good evening, not certain if this is the correct thread, let me know.
I recieved a new Lilja .22lr straight taper barrel in last week and its bolted on. Per Lilja's suggestion and my own thoughts, the head space is set to .042(measured 3 or maybe 11 times) as I prefer SK Match and have plenty.
CCI SS did not chamber, Ely Match had a couple of light strikes and a few failures to extract spent case and unfired rounds did not extract. SK match fired quite well though did not extract unfired round.
Per Lilja, this chamber does not extract certain ammo. Thought I read on the site that the new Lilja chamber did extract unfired, though as I was corrected by Lilja, it doesn't. I do not want to use a steal pick to pull out a stuck round evety time the range call a cease fire. Thoughts?
I recieved a new Lilja .22lr straight taper barrel in last week and its bolted on. Per Lilja's suggestion and my own thoughts, the head space is set to .042(measured 3 or maybe 11 times) as I prefer SK Match and have plenty.
CCI SS did not chamber, Ely Match had a couple of light strikes and a few failures to extract spent case and unfired rounds did not extract. SK match fired quite well though did not extract unfired round.
Per Lilja, this chamber does not extract certain ammo. Thought I read on the site that the new Lilja chamber did extract unfired, though as I was corrected by Lilja, it doesn't. I do not want to use a steal pick to pull out a stuck round evety time the range call a cease fire. Thoughts?
Use wooden dowel or very carefully a coated cleaning rod to push down barrel. My dowel is in gun case. You can't get a live round out! ( again dowel ). I'm set for Eley with .003 shims might go out .004. What shims are you using? CZ is no help they don't like aftermarket barrels. I had trouble yesterday, but I extracted like I meant it. Why do CZ barrels shoot most everything and aftermarket( Lilja and Bartlein) are very fussy. Just keep changing shims, its not that hard. I went from .008 ( don't do that )to .003. What torque barrel and stock?
Fred
SK has a narrower rim diameter than most .22lr ammunition which is why it dies not extract very well with original T Bolt rifles which have a weak extractor spring and poor extractor leverage. It will extract reliably from a Brno or CZ rifle with original barrel BUT if the Lilja barrel has a very tight chamber ... the extractor is likely to have difficulty removing a fired SK case.
Good evening,
My headspace is set to .042 and I use .008 worth of shims to get there. My action screws were torqued to 45lb in a KRG Bravo. I don't mind playing with the headspace, just that my schedule makes it tough to get to range (county park) often enough to even remember what I did that last time I was there. So every adjustment will be 2 to 3 weekends in between. Wonder what kind of looks I'll get when they call a cease fire and I jump up to ram a stick down my shiny barrel?! I guess I'll try .043 and see what that gets me. Thanks for the insights.
pete
My headspace is set to .042 and I use .008 worth of shims to get there. My action screws were torqued to 45lb in a KRG Bravo. I don't mind playing with the headspace, just that my schedule makes it tough to get to range (county park) often enough to even remember what I did that last time I was there. So every adjustment will be 2 to 3 weekends in between. Wonder what kind of looks I'll get when they call a cease fire and I jump up to ram a stick down my shiny barrel?! I guess I'll try .043 and see what that gets me. Thanks for the insights.
pete
I did the fitting & chambering of the two Shilen barrels I have on 457 American & VPT. Set headspace at .043" IIRC, and the chambers were cut with a PTG EPS reamer, which is fairly tight (.225" dia at front & rear of chamber), and I've not had any issues with the 457 extractors pulling fired cases or un-fired SK rounds out - and that's basically all I shoot in both these rifles. Just tried loaded rounds of SK Std+ in the VPT & a couple of my V-22s - the CZ worked fine, but one of the V-22s failed to extract while the other one worked fine. Odd, since the CZ has a Shilen ratchet, while both the V-22s have Kreigers, and I fitted & chambered them all with the same EPS reamer. The V-22 that failed to extract is a sporter that's seen little or no use recently, while the other V-22 has been shot quite a bit recently while I've been working at finding the tune on it with a new Harrells' tuner. I probably should remove the extractor/pusher out of the bolt nose of the V-22 sporter and do a thorough cleaning job on it, since it was carried daily in my work truck here on the farm for several months, up until I set it aside and started carrying the 457 VPT. The sporter's bolt nose could very well be dirty from all the dust it was exposed to during the past summer months of pretty dry weather.
My range call a cease fire every 15 minutes for target changes and people leaving and coming in.
I imagine ramming a stick in the barrel three times in a match would be quite frustrating, especially with a fancy barrel.
So you didn't add any shims? You left the headspace as is?
pete
I imagine ramming a stick in the barrel three times in a match would be quite frustrating, especially with a fancy barrel.
So you didn't add any shims? You left the headspace as is?
pete
Started at 6 went up to 8 that was really bad. Lilija said try 3, thats where I shot yesterday. When I got home moved to 4.( left out .00).I think at .003 barrel hitting bolt face. Down that low its set for Eley, maybe RWS. It's a real pain. I'm retired but its NE, playing weather.Try 6 for SK. Good luck!!
Please tell us what actually fixes your problem with the barrel. I am thinking of getting the Lilja barrel but might just skip the hassel and just get a Gen 3 Vudoo and that works and is supported by customer service that can actually help in solving problems. It's sad to see that CZ is like all big manufactures that spend more on marketing than on providing good quality parts & customer service for their products. This is a good story that everyone needs to follow.
That's an unfair statement. The poster has swapped out a factory barrel with aftermarket. How is his lack of stellar results the fault of CZ? It's also unfair to compare a $700 production CZ rifle with a $3700 semi custom Vudoo. CZ's are popular with shooters who want accuracy for a reason. They shoot better than their price tag suggests and are put together very well. Buy what you like but don't trash others choices to defend yours.
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Just keep CZ barrel. Mine shoot well, but like other people, I think I can do better.
I installed a 419 ARCA Rail on my 455 Manners stock and had to do a little milling on the rear of the rail to get it to sit flat on the Manners. Easy if you have a milling machine. You can use varying thickness washers at the screw points which will be functional but the look may not suit you.
I did go ahead and install the 8” on the Boyd’s stock. I think I could’ve gotten away with the 10” even tho I ran out of milled area in the rear of the stock it would’ve given me a couple inches I needed on the front end :
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I am considering adding a 2 stage "Triggers By Scar" trigger to my 457. I have my action installed in an Oryx Chassis. According to Bill Scaramuzzo the following chassis systems will not accept his trigger:
1). MDT LSS-RF GEN CHASSIS SYSTEM, inletting may not be possible
2). CZ 457 Varmint Precision Chassis, can be inlet, but requires a milling machine
Has anyone installed a Scar trigger in an Oryx chassis? I am concerned becauase the Oryx chassis is made by MDT and I assume that the same inlet dimensions are used in both the MDT LSS-RF chassis and the Oryx chassis.
1). MDT LSS-RF GEN CHASSIS SYSTEM, inletting may not be possible
2). CZ 457 Varmint Precision Chassis, can be inlet, but requires a milling machine
Has anyone installed a Scar trigger in an Oryx chassis? I am concerned becauase the Oryx chassis is made by MDT and I assume that the same inlet dimensions are used in both the MDT LSS-RF chassis and the Oryx chassis.
Re installing the action screws what is the right lb per sq in for the CZ 457 in a Boyd’s stock 20,25,30 for best results ??
I played around from 15 to 35, had best results at 27-28 front, 20 rear.
I have a buddy with one that liked a 25-25 split best.
I'd start around there and experiment a little. I was reluctant to go much higher because I felt like the wood would compress (no bedding or pillars)
It's in a KRG Bravo now.
Dave
ETA: The above refers to the At-one stock from CZ.
I have a buddy with one that liked a 25-25 split best.
I'd start around there and experiment a little. I was reluctant to go much higher because I felt like the wood would compress (no bedding or pillars)
It's in a KRG Bravo now.
Dave
ETA: The above refers to the At-one stock from CZ.
This...
My buddy's and my 457s are both At-Ones, same length barrel, test groups dated a few days apart. They like different torque settings, and different ammo.
Dave
My buddy's and my 457s are both At-Ones, same length barrel, test groups dated a few days apart. They like different torque settings, and different ammo.
Dave
So, an update on the Lilija barrel on the CZ 457 22lr. in a KRG Bravo chassis.
Reset the barrel with .006 headspace. I used the .002 and .004 shims. Grub screws torqued to 45 in lbs. and action screws at 45 in. lbs. as well. Both these settings are factory recommended settings. Shot same lot of SK Rifle Match. It went well ! Bolt felt a bit smoother and definitely closed with only the typical new rifle bolt tightness if not a bit lighter, needing less effort to close. Unfired SK did not eject and I had to pull them out. Need to get a dowel! I had no light strikes and all fired rounds ejected fine. Tried some Ely Match and results were not as good groups were more open and I'm sure I pulled one as it was outside the square. Out of ten rounds, 2 light strikes and 1 would not extract. I am sticking to the SK match for now. As you can see, the day was awesome, 81 degrees, with a left to right breeze of 4 to 7 mph(someone there said it was, so I'm typing it)
Not happy with the failure to extract and the pickiness of the ammo, though the results were pretty good. All targets at 50 yards.
Will keep testing and I do appreciate your comments and suggestions.
Best regards,
pete
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