Harrell Precision Tuner on Lothar Walther Barrell

| August 8, 2020 | 5 Comments

Some say (like my wife) that I am way down the rabbit hole on this project. I absolutely love the CZ brand of rimfire rifles. This 455 like many others have shot continue to live up to my expectations. Though I got this wild hair that just maybe I could use the versatility of the CZ455 being able to swap barrels at home and make it just as accurate as a Vudoo at a much cheaper price.?

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I started first by pillar bedding and fully bedding the action. I have since added Anarchy Outdoors bottom metal which is thicker than the original which allows for possibly greater torque without bending your metal. The trigger has been modified with a Yo Dave Trigger Kit and Plus 10% Striker spring for great consistency in primer strikes. The firing pin has been polished and the head squared to deliver even more consistency in the ignition process. This work would have the CZ 455 consistently shooting in the range of .550in — .750in groups at 50 yards depending upon the ammunition.?

I decided to amp it up a bit and got a CZ455 drop in Lothar Walther barrel. With this barrel the groups would definitely get tighter shooting .445in — .650in groups at 50 yards, again depending upon the ammunition. The only fault I found with the new Lothar Walther barrel was a thread protector was not included so I had to have one made.?

I would begin the mission of finding the right ammunition for the new barrel.?

It was recommended that I try Fiocchi 320 I liked what I was seeing out of this ammunition. Right about the same time, Kenny from Desert Precision Gunworks pushed me deeper into the rabbit hole by recommending a Harrell Precision Tuner.? After speaking with them inquiring about the AR15 Muzzle Break Tuner being a direct fit and potential enhanced accuracy I decided this would be “potentially” my last upgrade.

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Really nothing more to do other than shoot the darn rifle. I mean could I be that bad of a shot to need all these upgrades?

After all of these upgrades I am right at $1,020 dollars. Did I meet my goal of building a CZ455 that is lovely to look at but deadly on the range capable of competing with the Vudoo line of rifles? After tuning the break I went on to shoot these groups.

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With Fiocchi 320 these 3 groups the last groups of the day came in at .306in – ,490inch. Other groups you see not measured were groups shot while finding the sweet spot for the tuner.

So this journey’s groups in inches look like this

.550in — .750in to? .445in — .650in eventually ending up at .306in – ,490in notice the rest setup sand bags. No where near as sturdy as my Caldwell BR which I had forgot at home.

Many have stated I should weigh and sort my 22 ammo by rim thickness. This is something I have measured before in some testing here, in my love hate relationship with sorting 22LR

Though it did seem to make some difference on the target. I am not sure it is worth my time even now. This could change some where down this rabbit hole.

Is there light at the end of this project and rabbit hole? I still want to test Lapua X Act with the tuner and new comers to this little experiment RWS50, Midas+, SK Rifle Match, Wolf Match Extra and CCI-SV.

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There are some that enjoy pushing me further down the rabbit hole, getting a kick out of the torture and donated to paypal.me/MrRevolverguy to see this ammo tested, it is coming. I am not sure this is where I am supposed to thank those who donated or grimace at them.

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5 Comments on "Harrell Precision Tuner on Lothar Walther Barrell"

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  1. Luis Matias says:

    Will you get a chance to try the new family of cz the cz 457 MTR or the 457 long range precision.

  2. I hope one day soon to get to try a MTR or a Precision for that matter heck I hope both. The Long Range Precision is not imported here in the US yet. Most of what you see on the website are loaners I have borrowed from other people. I am blessed that they like the content and trust me to loan me their prized possessions for a day or two. At this time know one in those circles have either of those rifles, but there is someone who has been talking bout an MTR since they showed up on the scene. Hopefully one day soon for you.

  3. kelly shawn carroll says:

    Hey pistol guy,
    If you get a 457 you may find the trigger to be in need of help. The factory spring has about a .028″ wire diameter. If you go to McMaster Carr, you can order springs with a different rate. The .018″ wire spring is #9657K612 and the .014″ wire is 9657K611. The over all length is .375″ with a .148″ OD so only the wire diameter changes. It’s also super easy to lap the trigger sear only with some 9 and then 3 micron PSA lapping film. Both can be bought on evil bay by the sheet.
    The trigger pin has been staked in place (dimples on the ends) so I highly recommend that you sand down one end of it to ease the reassembly process. When you go to drive the pin out, you will understand why I suggest you use some 220 wet/dry on at least one end. Chuck the pin up in a drill and It only takes about 15 seconds and it will save you lots of grief. I adjust the sear engagement by turning the screws inwards until it dry fires and the back out by 90degress. That will yield a very short, crisp trigger. The rest of the adjustments are up to your personal needs.

  4. kelly shawn carroll says:

    Hi pistol guy….

    I would try a B14R if you get a chance. On 07/25/21 , I shot four five shot groups with a bone stock gun. With a cold bore and silencer I got 1.125″ctc group….That blew chunks so without the can and no scope adjustment : .216″ctc,.356″ctc and .270ctc all at 50 yards from a flaky plastic table, Atlas bi-pod and rear bag. The B14R trigger is heavy but predictable. It’s nothing like my Trigger Tech Diamond 4 oz. unit that is in my Vudoo. Still I think it’s a nice gun for $950.00
    The scope was a Trijicon 5-50×56 Accu-power bought from B&H Photo. (1800.00) I bought from them because they allow you a 30 day test drive with a satisfaction guarantee. It was such a nice scope that a couple months later I bought a second one. The ammo was lot tested Center X. When Lapua tested the Bergara, some of the other lots of Center X opened up to over an inch so it makes a big difference.

  5. Joseph Stanczak says:

    What were the results of this barrel and tuner combo at 100 yards and beyond? My CZ455 shoots sub-MOA at 50, MOA at 100, but opens up to 2MOA at 200.

    Also are you in OH? I’m in the Akron area.

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