CZ 457 Bolt Shims - trigger shims - do they actually work?

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CZ 457 Bolt Shims - trigger shims - do they actually work?
In this video we test Trigger Shim shim kits for the CZ 457 LRP to see if we can extract more accuracy playing with head space. Starting with a factory rifle shooting a few groups to get a baseline. when our baseline groups have been fired we start testing the shims in order from thinnest to thickest. with the thinnest shim installed we fire a couple more 5 shot groups then move to the next thickness of shim and so on. Get comfortable crack a beer and stay tuned because you are watching Browned on RU-vid!
This is a CZ 457 review and Trigger Shim test
Rifle setup: Timney trigger, amazon arca rail custom fit, Valquartsen exact edge extractor one side only, Bipod Factory Carbon Fiber 6-9" swivel BIPOD, Discovery Optics ED PRS 5-25 gen 2, IBI Barrel
Hope you enjoy the testing and DON'T FORGET TO SUBSCRIBE! , COMMENT, AND LIKE! the video.
There will be new videos releasing every Sunday morning at 9 am!
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parts used: Timney trigger, amazon arca rail custom fit, Valquartsen exact edge extractors, Bipod Factory Carbon Fiber BIPOD, Discovery Optics ED PRS 5-25 gen 2, IBI Barrel
Hope you enjoy the testing and DON'T FORGET TO SUBSCRIBE! , COMMENT, AND LIKE! the video.
There will be new videos releasing every Sunday morning at 9 am!

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11 май 2024

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Комментарии : 79

@22rimfireultra67 Месяц назад

Very nice planned out video test! Enjoyable and informative to watch! The camera images of the target were good enough for me to measure and calculate averages for the groups (keeping in mind the measurements are not as exact as would be if target were in hand, but the measured results still offer insight). The pertinent groups are the factory group and the 0.015 bolt shim groups. The rest were significant enough to be excluded out right. Groups measured CTC. Factory 3 groups: 0.89", 0.58", 0.50". Average= 0.65". Shim 0.015 Groups x 3: 0.42", 0.41", 0.71". Average=0.51". F/U Shim 0.015 Groups x 4: 0.38", 0.46", 0.43", 0.54". Average=0.45" Cumulative Shim 0.015 Groups x 7: Average=0.47" That is a Whopping 💥 38% difference between factory and 0.015 bolt shim. A consistent level of performance improvement with a known good medium grade ammunition. It would have been nice to have had 4 more groups from factory set up, however, historically from my experience, the results of the 3 factory groups presented seem typical for a good day out with same or similar set up and ammunition. This should translate to improved accuracy on target bulls as well. Great video................thanks!🙂

@BROTUNED Месяц назад

Thanks for doing the calculations really appreciate that. I really should have done it and included it in the video. Now for next time I’ll make sure I do it.

@22rimfireultra67 Месяц назад

@@BROTUNED Oh, I enjoyed doing 🤓it pretty much !

@johnstewart2011 Месяц назад

“One accurate measurement is worth a thousand expert opinions.” Once again you do a better job with your tests than most RU-vidrs.

@donniepowell7146 Месяц назад

Amazes me that one and half thousands makes such a difference.

@martin2514 Месяц назад

Make sure you put a bit of oil on the shims. You can extend the life by a lot. I make these in the UK. Depending on the material the shims are made of can affect the life of them. They are designed to be stacked. Oiling them extends the life a lot. I make them for the CZ457, CZ 455, 452 and Brno as well as the anschutzs match 54 action.

@BROTUNED Месяц назад

Thanks for sharing this

@JoDel-qam4u Месяц назад

Thank you for taking the time and ammo to make this video. Now we know what to expect.🥥🥥

@johnterhark6516 Месяц назад

Great testing video. 3 thousands shim worked the best on my MTR.

@BROTUNED Месяц назад

The .003” was very good in mine also

@jgs3647 Месяц назад

appreciate the time and effort involved with this test top man.

@BROTUNED Месяц назад

Thanks so much

@foonus406 Месяц назад

Wonder why your groups are opening up as you move down the target? I bet if you put a piece of plywood shim under your bag instead of pinching up on it to hit those lower targets they would look a lot closer to the ones on top. My 455 has a pretty stiff bolt close with the SK ammo, but it does shoot really well. When benchrest shooters shoot .22 they clean the barrel as often as possible, I am convinced there is a reason for that. I would try to clean the barrel with the swap of each shim, take 5 foulers on the bottom target, and move up the line to see the groups with the barrel in the same state - there were over 100 rounds between the first and last groups. Running a chronograph while testing isn't a bad idea either, as you can see easlily if there was a notable FPS difference in any "flyers" . Thanks for the video!

@BROTUNED Месяц назад

Great point I may have to revisit this

@misterlewgee8874 Месяц назад

Getting statistically significant result from shooting groups apparently takes alot of shots...re hornady podcast groups size...

@dougkrogh4262 Месяц назад

Good review 👍

@joea4998 Месяц назад

Great test I may need to give this a try. Looks like it tightened it up quite a bit. Thanks

@fourty-sevenkick2398 Месяц назад

Nice work, informative, solid!

@BROTUNED Месяц назад

Much appreciated! Thanks

@vincebelmonte7710 Месяц назад

Wow great just ordred and received two sets for my CZ's your vid surly came in at the wright time thanks BRO

@BROTUNED Месяц назад

Glad I could help cheers and enjoy

@audieladd2476 Месяц назад

Match Winning Rifle Shim Installation Method. Stack all the shims and drive the bolt in with a copper mallet. Do not use a metal hammer as it may damage the bolt.

@BROTUNED Месяц назад

lol

@audieladd2476 Месяц назад

@@BROTUNED 🤣

@pitts3219 Месяц назад

Most CZ’s headspace are factory set at .46 and .43 is ideal for SK.

@PursuitofAccuracy Месяц назад

Just messed with some shims in the b14r and had some interesting results. I ran a kind of inverse test to yours where i shimmed the best feeling headspace and tested it across the ammo i had shot in the baseline.

@JuicyJust180 Месяц назад

Thank you for this one!

@BROTUNED Месяц назад

My pleasure!

@fredshebester-wg4vb Месяц назад

That 0.015 is shooting lights out. Thanks for these videos. You are saving me alot of money, by trying things first.😊

@BROTUNED Месяц назад

My pleasure have a great day!

@7come11two Месяц назад

I tried these in my 457, and I couldn't tell they made any difference at all.

@CountryRimfire Месяц назад

Wow that is crazy 🤪 Nice video Ryan! Now I want to try this 😮

@BROTUNED Месяц назад

It’s a great way to get a little more from a great rifle at a low price

@donaldhanger9807 Месяц назад

Great shooting II may need to get some. Shims!

@esoxecosse66 Месяц назад

Nice one Ryan, got the shims ages ago but haven't tried them yet so you've prompted me to get the finger out and give them a go 👍

@BROTUNED Месяц назад

Go for it! Let me know how you make out

@dttrandom Месяц назад

Thanks for this vid. I've seen other vids of CZ 457 with shims installed but they were done by measuring head space and such and doing a bit of math to determine which shim to use. This one you did by actually testing all the shims. I've bought the shims but have yet to install any. I planned on doing them by measuring head space and doing the math since it's the least amount of work and doesn't use up as much ammo, but I keep thinking that with my slight OCD that I won't be able to resist testing all the shims like you just did.

@paddywoolley6035 Месяц назад

I did the measure and maths now you got me thinking about doing this too, I know my Army lads aint good with maths either

@drewhunt8038 Месяц назад

Good video fellow Canadian!

@BROTUNED Месяц назад

Thanks cheers! 🍻

@markthibault8579 Месяц назад

Interesting test on something I was curious about with my own 457. I have yet to find some match ammo consistent enough in my MTR to warrent going the extra distance to try shims.

@Dayattherange Месяц назад

Nice way to test and be absolutely sure, When I installed mine I did it based on headspace and closing of the bolt though I ended up with much the same result. You sort of want the bolt snug not TIGHT. Just trying to get the most consistent headspace possible as rim thickness on 22lr can vary even in high dollar ammo.

@BROTUNED Месяц назад

With the.005” shim bolt close was stressed for sure. .0015” was almost as easy as factory

@mus1970 Месяц назад

Nice effort, thank you for your time, patience, and energy. I'm wondering though, with different ammo (for example Eley, which usually has thicker rims) would you need to repeat the test and perhaps end up with a different shim/no shim?

@BROTUNED Месяц назад

I’m guessing that it would be like a tuner and some ammunition would prefer different head space settings

@misterlewgee8874 Месяц назад

I enjoyed Thank you A factory 10 shot group may have been the same as the 1.5 thou ten shot group... The 1.5 thou did look promising. A smaller aiming point may also help...also..for test..maybe keep the point of impact away from point of aim so impacts don't damage your aiming mark. ... Well done though. Would like to see a follow up with factory vs 1.5 thou and maybe another shim. 20 shot groups?..or a larger sample... Mean radius comes to mind too...and possible fliers due to velocity... A great start.

@Jeff-mv4yy Месяц назад

Nice demo , if not too much trouble , it would be great to see back to back with some premium ammo the rifle loves . Thanks for showing . I’m always afraod to take my bolt apart . I stretched the extractor spring once and rifle quit extracting . I had to order from Lithuania and paid a kings ransom . Nowhere in NA had a replacement

@BROTUNED Месяц назад

Ya I can do something like that for sure

@johngarrett6256 Месяц назад

I think you will like it more at 100 and 200 shoots real nice.👍😀

@plinkspot8750 Месяц назад

Man, chasing .22lr groups is a very, very deep rabbit hole. Nothing ever feels "perfect"

@BROTUNED Месяц назад

Yes that’s for sure 👍🏻

@danfromga9696 Месяц назад

One thing consistent about rimfire is that it's inconsistent

@audieladd2476 Месяц назад

Anschutz's don't need shims, they come tuned from the factory. Like bacon, everything is better with an Anschutz.

@rustynut1967 Месяц назад

Great video! I'm going to order some shims so I can hopefully give my buddys Bergara a challenge. We're close but he is a little more consistent and just a tad tighter groups. 😊

@BROTUNED Месяц назад

You can do it! Cheers

@rustynut1967 Месяц назад

@@BROTUNED 😁 I just got done putting in a .0015" shim and did the firing pin mod. We'll see.

@ericf4779 29 дней назад

Great video on adjusting headspace with shims. I normally measure first and use barrel shims on my CZ 457's, but bolt shims work, as well. I try to get to .041 for SK ammo. What are your action screw torque settings? Just curious.

@BROTUNED 15 дней назад

I use 32”/lbs action screws and 35”/lbs for the barrel

@FC64002 Месяц назад

I would leave it alone right there

@gushlergushler Месяц назад

That was really instructional.... I now need to check where I in Europe I can order shims from.

@BROTUNED Месяц назад

I’m sure you can order them from triggershims.com

@gushlergushler Месяц назад

@@BROTUNED Just did actually :D they ought to give you a kickback if they notice a surge of new customers now lol

@BROTUNED Месяц назад

That would be nice ha ha but basically I pay for all my stuff I don’t get much help since I live in Canada. No one hooks me up. That’s fine I’d be doing to same regardless. Cheers and enjoy

@gushlergushler Месяц назад

@@BROTUNED I appreciate your work even more then. Cheers and good shooting.

@BROTUNED Месяц назад

Thank you I appreciate that

@takedeadaim8671 Месяц назад

Did you do any measuring to determine actual headspace on the rifle? Testing against a known rim thickness (go gauge) so you know how tight your actually getting, can shed some light on the on paper results.

@BROTUNED 15 дней назад

O I just figured I’d do blind science and just see if there is a difference

@HSmith-uk9hl Месяц назад

Second target with the .005" shim has only three shots on it. Your last two shots were in the second target with the .004" shim. IOW, you have seven shots in the second .004" shim target and only three in the second .005" shim target. But no matter your best results seem to have been with the .015" shim.

@sherryengrav3370 Месяц назад

Be sure agrees the shim so it doesn’t wear the bolt

@richardfisher3656 Месяц назад

Where you buy the bolt shims ??

@BROTUNED Месяц назад

I believe the site is triggershims.com

@douggiek9 Месяц назад

Where can you get the shims from? Thank you

@BROTUNED Месяц назад

triggershims.com is where I got mine

@richarddesimone4451 Месяц назад

How can you do any quality testing with less than lot tested match ammunition? Then sometime you say "it was me". But then others go out of the group and you say nothing??

@BROTUNED Месяц назад

If I say it was me I broke the shot off my aim point. But if I feel I broke the shot and the aim point was where I wanted it I don’t say anything. SK standard plus shoots moa from my rifle and it’s my go to plinking ammo so I figured it would be the best ammo for me to test with since it’s what I shoot 99% of the time. I test everything I can get my hands on for RU-vid but when I’m playing around off camera it’s 99% of the time SK standard plus.

@richarddesimone4451 Месяц назад

@@BROTUNED that's just it! Its "plinking" ammo, not testing ammo. I appreciate the work you do on the video's, but it's not valid results, in this case, for the shims. If you were just testing one brand against others, that's valid..or say different lots against each other, but to test plink ingredients ammo against varying shim thickness? I don't think so!

@davegrimshaw7318 Месяц назад

Plinking ammo is best to test, if you can tighten up a cheap ammo, save loads of money down the line..

@Mr.Spectaculous Месяц назад

I like the content. Watching on the big screen TV. I'm nobody in rimfire but do shoot a lot. I think I'm seeing something in your shooting that I also see in mine. You seem to have a preference for an area on the paper that produces the best group. You didn't measure them but from my couch it looks like the best groups came at the top of the targets. Larger groups towards the bottom. The 457 receiver is capable of flexing. I'm not sure I'd want it too tight to close. Plus not to mention the position upset you might be experiencing with the increased effort. Hard to tell from the TV. If you are ever in Florida look me up. I'll take you inshore fishing.

@BROTUNED Месяц назад

Thanks I’d appreciate that