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Bolt Shim Reviews - Under Construction

Tech Tip: Anschutz 1712 w/ Targets

I just wanted to say, that your bolt shims are just what the doctor ordered.
It is not often that you find such a simple fix to anything, but these truly are.
Thank You! Trent in UT

TriggerShims Snek

Rimfire Rifle Bolt Shim Index


Expanded Selection of Rimfire Rifle Bolt Shims for 2023

Links to Our Growing List of .22 Rifle Bolt Shims

  1. Anschutz 54 ~ Now In Stock!
  2. Australian Lithgow LA 101
  3. Bergara B-14R Rimfire Bolt Shims
  4. CZ / BRNO Rimfire Bolt Shims
  5. CZ 457 Rimfire Bolt Shims
  6. Kimber 82G Target Rifle Bolt Shims
  7. Marlin 80 / 983 Rimfire Bolt Shims
  8. Mossberg 44 U.S. Bolt
  9. Mossberg 144 LSB Bolt
  10. Remington 40X Bolt Shims
  11. Remington 504T Bolt Shims
  12. Remington 513T / 521T Rimfire Rifle
  13. Remington 540X Bolt Shims
  14. Ruger American Rimfire Bolt Shims
  15. Ruger 77/17 77/22 Bolt Shims
  16. Savage BMag Bolt Shims - Coming May 2023
  17. Savage MKII Bolt Shims - Prototype
  18. Suhl 150 Rimfire Rifle
  19. Tikka T1x and Sako P72 / M78 Rimfire Rifle
  20. Walther KK500 Rimfire Bolt Shims
  21. Winchester 52 Bolt Shims
  22. Winchester 75S Bolt Shims
  23. New for 2023

  24. CZ 455/457 Barrel (NOT BOLT) Shims
  25. NOTE: email me to be put on a list to be notified when new Bolt Shims are ready ~ Send Lance an Email ~


Selection of Rimfire Rifle Bolt Shims Sorted by Size

Bolt Shims Sorted by I.D. Size

  1. .357 x .595 Remington 540X Bolt
  2. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
  3. .376 x .565 CZ 457 Rimfire Bolt
  4. .442 x .595 Mossberg 44 U.S. Bolt and H&R M12
  5. .442 x .648 Ruger 77/22 Bolt
  6. .450 x .565 Winchester 69A / 75S Bolt
  7. .450 x .595 Marlin 983 Bolt & Remington 504T
  8. .480 x .570 Remington 513
  9. .480 x .610 Mossberg 144 LSB
  10. .480 x .648 Savage MKII Bolt
  11. .480 x .751 Walther KK500 Bolt Shim
  12. .500 x .610 Kimber 82 U.S. Bolt
  13. .500 x .648 Bergara B14-R Bolt
  14. .511 x .648 Winchester 52 / Suhl 150 Bolt
  15. .532 x .640 Anschutz 54
  16. .550 x .670 Tikka T1x
  17. .570 x .690 Remington 40X Bolt
  18. .595 x .690 Lithgow LA101 Bolt
  19. .610 x .690 CZ / BRNO Bolt
  20. .710 x .850 CZ Barrel Shim

Bolt Shims Sorted by O.D. Size

  1. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
  2. .376 x .565 CZ 457 Rimfire Bolt
  3. .450 x .565 Winchester 69A / 75S Bolt
  4. .480 x .570 Remington 513
  5. .357 x .595 Remington 540X Bolt
  6. .442 x .595 Mossberg 44 U.S. Bolt and H&R M12
  7. .450 x .595 Marlin 983 Bolt & Remington 504T
  8. .500 x .610 Kimber 82 U.S. Bolt
  9. .480 x .610 Mossberg 144 LSB
  10. .532 x .640 Anschutz 54
  11. .442 x .648 Ruger 77/22 Bolt
  12. .480 x .648 Savage MKII Bolt
  13. .500 x .648 Bergara B14-R Bolt
  14. .511 x .648 Winchester 52 / Suhl 150 Bolt
  15. .550 x .670 Tikka T1x
  16. .570 x .690 Remington 40X Bolt
  17. .595 x .690 Lithgow LA101 Bolt
  18. .610 x .690 CZ / BRNO Bolt
  19. .480 x .751 Walther KK500 Bolt Shim
  20. .710 x .850 CZ Barrel Shim


Bolt Shim Instructions
TriggerShims Snek

TECH TIP: Rimfire Bolt Shim Installation
~ A General Guide ~

Rimmed Cartridges use the thickness of the cartridge rim for head-spacing .22 Rimfires Headspace on the Case Rim, and the actual head space is in the recessed face of the bolt.
Shimming between the two bolt halves ensures the bolt is up gently tight against the breech.
I cannot tell you which shim best works with your rifle, you decide that yourself by fitting and feel and by shooting.
Installing Bolt Shims requires fitting by hand, and checking with the Bolt installed in the Rifle, and Locked Down - you do not measure with the Bolt out of the Rifle.
To establish the Bolt/Breech fit, shims are installed and fitted on an empty chamber. Start with a 4 or 5 Pak of shims, install the .0015" or .002" thinnest shim and see how your bolt closes, if it seems to close as normal, then continue to install each thicker shim until the bolt starts to close harder than normal. At the point where your bolt begins to close hard, that was the amount of slack that was in your bolt, measured by whatever shim or shims combined were needed to bring the bolt up tight to the breech. Now it is best to remove that shim, and step back one number, example would be if a .005" Red shim causes the bolt handle to close harder than normal, then take it out and install a .004" Purple.
If you have to force or put undue stress on your bolt to close it, you should reduce the number of shims. You will generally only use 1 of the 4 or 5 shims in the package, but you can stack shims together if needed. When you have the correct shim installed, your bolt should close normally or just (ever-so) slightly tighter than normal. Put a very small drop of oil on the shim. Now you can go to the range and with the barrel pointed in a safe direction, once again check fit with your favorite ammo.
Due to variations in rim thickness, you may have to reduce the thickness of shims, remember you have already removed all the excess headspace from the bolt/breech, so now the only thing to do is remove thickness (shims) if / as needed to get to your sweet spot or required headspace.
For Longest Shim Life, once you have have correctly fitted your shims Top Canadian Shooter Dan Walker from Inrange Rimfire recommends using a heavy grease.
If you have to force or put undue stress on your bolt to close it, you should reduce the number of shims. A minimum of clearance should be maintained, do not put undue stress on the bolt by shimming too tightly as it is unnecessary!
At no time do you want to force the bolt to close, did I explain that clearly?
Bolt Shims have in many instances cured light strikes. Will they help with Accuracy? Don't take my word for it, Read our the Customer Reviews or ask our Customers
Simply Chambering More Consistently, Yields More Consistent Results.
Your Satisfaction is Guaranteed, if you feel you got no benefit, you may send your shims back for a Full Refund.

TriggerShims Bolt Shim Instructions Copyright Oct/22


TECH TIP: Rimfire Rifle Bolt Shim Targets ~ Clay from Vancouver Island

Clay shares his Targets and Details with TriggerShims;

I've shot my Anschutz 1712 in smallbore silhouette for many years. It has probably over 300,000 rounds through it and for a while now I've been feeling like it hasn't been shooting quite as well as it used to. I normally feed it better than Federal bulk stuff, but I figured it was probably still a decent test to see what happened with it when going through the various shim thicknesses. The Federal stuff was on sale, and I wanted to test with rather large sample sizes to reduce error as much as possible. I decided to test 50-shot groups at 77 metres, which is turkey distance in that game, the third-furthest but hardest to hit target. Here is how it did before installing a shim and the results with the shims. I've included pictures of the groups..... (Continued Below)

  • MR = mean radius
  • No Shim: MR of 0.496 MOA, avg 1172 fps, SD 22.9, ES 106
  • 0.0015" shim: MR of 0.476 MOA, avg 1174 fps, SD 24.3, ES 118
  • 0.002" shim: MR of 0.469 MOA, avg 1167 fps, SD 23.5, ES 111
  • 0.003" shim: MR of 0.433 MOA, avg 1174 fps, SD 18.6, ES 90
  • 0.004" shim: MR of 0.404 MOA, avg 1173 fps, SD 20.1, ES 110
  • 0.005" shim: MR of 0.472 MOA, avg 1172 fps, SD 22.9, ES 102
  • Click on Any Photo to Enlarge

    Clay Continues;

    As this Federal bulk ammo shot before putting any shims in I would say it is not something I would consider using to shoot silhouette matches. The dispersion was just too great to have any confidence in it. It is pretty cheap ammo, so this is expected. I'll usually shoot Eley or Lapua/SK's lower end stuff for matches because it is much more reliable, shooting groups that are much better on average. I have to say, I was pleasantly surprised to see an 18.5% improvement here with the Federal and the 0.004" shim. The first couple of shims didn't seem to be enough for the amount of excess headspace that the rifle has after all the use it has seen. They showed very minor improvement, but not much to write home about. The third one looked a little better, but the fourth really smartened things up quite a bit. With the thickest one it actually started going off again, and it was showing some noticeable resistance when closing the bolt. I was surprised the 0.003" shim's group wasn't the best of the bunch, given it had the best SD. Oh well. Not the most consistent ammo anyway, hehe. I stepped backward to the 0.004" shim again and that'll be staying in the gun now. I'm curious to see how it will affect the Eley and Lapua/SK stuff now.
    Thanks for the shims! Seems to have smartened the rifle back up.

    Isaiah 5:20 Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!

    BOX# Bolt Shim Reviews

    TECH TIP: Bolt Shim Reviews

    Good Morning Lance,
    Another testimonial from a very happy customer. As previously mentioned, I was having failure to extract issues with my CZ457 with a custom ibi barrel. At first I considered that I potentially had a very close tolerance chamber, (which I do - cut with EleyEPS reamer), that was specific for only some types of ammunition. Or perhaps there were imperfections present that interfered with extraction(?). But given the fact that extraction was 100% with some ammo, and dropped to 60-70% with others, led me to measuring rim thickness. There was a consistent difference of 0.002 to 0.003 difference. Bit of a “Aha!” moment. Perhaps there was a bolt/extractor engagement issue. After visiting several websites, chat rooms, etc. I went back to ibi to confirm that I was on the right track. Excellent customer service from these folks, and a subsequent email confirmation that I was on the right path was received. They also list as the go-to for quality products related to bolt or barrel shims. I visited your site, read other folks reviews and committed to giving the bolt shimming process a try. Following the suggested trial/error fitting procedure, I was up to .007 before I noticed a definite resistance on closing the bolt. Backed off and refitted with shims totalling .0065. Resistance was less and it was time to go to the range for confirmation. Priority one was to determine if the ammunition that I was having major extraction issues with would actually cycle properly. Not one failure out of the first 10 rounds. However, I did note a stiff bolt closure on some cartridges Again, following your direction provided on your site, I backed off to .005 and tried again. Fired a full 100 rounds without one failure! Bolt engagement feels just fine. What a revelation! It would be an understatement to say I’m extremely happy with the result. Your shims are an easy install on the CZ457, and allows me to return to one of my favourite ammunition lines with confidence. Thank you again for making such a great product. Believe I will order another set, just in case lol!
    Kindest Regards ~ Stephen in BC

    Customer Mike from PA Writes:
    Lance, just a note to share the joy :-) your shims in my CZ 457 AT-ONE cut my groups (5 groups of 5 shots including cold bore shot) from 4 inch total of all five groups to 2.065 total of all five groups, almost in half. The CZ needed .007" of shims. It was little hard to open the bolt after firing so I backed down to 006, using a 004 and 002. Still shot a 7/16, a 5/16, a 3/8, a 7/16, a 5/8. Than I put 9 shots in 9/16 at 50 yds. I used to be sure of a 3/4 inch group, with an few 1/2 inch groups. I can't wait to see what I get at 100 yds and 150yds ~ Thank you for your product!

    Bolt Shims In Production as of
    December 18 2022

    Bolt Shims Sorted by OD Size

    1. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
    2. .376 x .565 CZ 457 Rimfire Bolt
    3. .450 x .565 Winchester 69A / 75S Bolt
    4. .480 x .570 Remington 513
    5. .357 x .595 Remington 540X Bolt
    6. .442 x .595 Mossberg 44 U.S. Bolt
    7. .450 x .595 Marlin 983 Bolt & Remington 504T
    8. .500 x .610 Kimber 82 U.S. Bolt
    9. .480 x .610 Mossberg 144 LSB
    10. .532 x .640 Anschutz 54
    11. .442 x .648 Ruger 77/22 Bolt
    12. .480 x .648 Savage MKII Bolt
    13. .500 x .648 Bergara B14-R Bolt
    14. .511 x .648 Winchester 52 / Suhl 150 Bolt
    15. .550 x .670 Tikka T1x
    16. .570 x .690 Remington 40X Bolt
    17. .595 x .690 Lithgow LA101 Bolt
    18. .610 x .690 CZ / BRNO Bolt
    19. .480 x .751 Walther KK500 Bolt Shim

    * All Available in New 5 Paks


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