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Thread: Yes you can shorten CZ452's (And still be accurate!)

  1. #1

    Yes you can shorten CZ452's (And still be accurate!)

    I gave my .22 WMR CZ452 to James (JagerSA) for a shorten to 16", re-thread, crown and coating and had read various opinions about the CZ rifles not being able to be shortened due to the tapered barrel. Well I can now confirm that with a decent job they can be made more accurate than before!!

    Finally got out without being in a gale last night to zero at 100 yds and quite pleased with the result. Ignoring the 1 outside the 1" dot at 2 o'clock which was my mates hmr, and the one low down which needed a click up, the others aint too shabby!



    I also think it looks a treat with the WTC scope on and even the shrink wrap I put on the SAK mod matches the finish!



    So if you have been pondering it then have no fear I lopped off 6" with no ill effect.

    Cheers again James for a top job at a great price

    Stratts
    Last edited by stratts; 18-03-2015 at 21:18. Reason: Size matters!!
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  2. #2
    Thanks for posting that Stratts.
    Out of curiosity, why did you got for 14"?.
    The conventional wisdom seems to reckon that 16" is the all powder burned / optimum length.
    "Don't say I didnae warn ye !"

  3. #3
    Simply for ease of use in a motor mate and when the SAK is on the end it is nicely balanced now too.

    I also found this chart online which showed that there is minimal difference in MV from 16" to 14" with most rounds and some even go back up!

    Cheers

    barrel length CCI
    Game-
    point
    40 gr.
    JSP
    CCI
    Maxi-
    Mag
    40 gr.
    JHP
    CCI
    Maxi-
    Mag
    HP+V
    30 gr.
    JHP
    CCI
    V-Max
    30 gr.
    polymer
    tip
    Federal
    30 gr.
    Speer
    TNT HP
    Fiocchi
    PSD
    40 gr.
    JSP
    Fiocchi
    PSD
    40 gr.
    JHP
    Hornady
    45 gr.
    Flex
    Tip
    eXpand-
    ing
    Hornady
    V-Max
    30 gr.
    Hornady
    25 gr.
    NTX
    Win'ster
    30 gr.
    Hornady
    Polymer
    Tip
    V-Max
    19" 1827 1999 2285 2348 2355 1908 1936 1773 2296 2265 2149
    18" 1837 1985 2322 2298 2324 1920 1950 1764 2313 2235 2110
    17" 1825 1980 2280 2288 2334 1918 1938 1755 2318 2241 2160
    16" 1780 1987 2316 2276 2283 1887 1934 1702 2252 2166 2129
    15" 1799 1967 2304 2294 2275 1916 1873 1738 2240 2229 2127
    14" 1783 1963 2230 2298 2244 1885 1951 1751 2243 2250 2105
    13" 1749 1889 2181 2220 2227 1852 1886 1698 2245 2191 2071
    12" 1750 1881 2168 2204 2163 1843 1811 1699 2144 2138 2052
    11" 1709 1835 2079 2097 2135 1788 1845 1652 2093 2146 1989
    10" 1687 1817 2060 2144 2102 1791 1772 1643 2069 2065 1951
    9" 1672 1759 2000 2061 2018 1723 1772 1630 1966 2024 1924
    8" 1594 1706 1950 2012 1979 1650 1696 1536 1977 1928 1803
    7" 1529 1617 1887 1904 1879 1626 1606 1525 1821 1818 1763
    6" 1484 1575 1763 1804 1821 1526 1544 1454 1740 1824 1694
    5" 1355 1474 1672 1723 1657 1433 1477 1307 1602 1670 1575
    4" 1248 1353 1510 1504 1457 1287 1269 1239 1379 1492 1454
    3" 1089 1160 1236 1336 1228 1101 1117 1049 1153 1308 1288
    2" 887 946 884 1085 895 899 853 843 962 1114 n/a
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  4. #4
    "Don't say I didnae warn ye !"

  5. #5
    The taper mainly just gives a continual engraving to the cast lead bullets.

    Shortening a rimmy barrel will not necessarily give a reduction in performance but if it happens to be cut/shortened to a slack spot in the barrel (as most all factory barrels are not lapped) then you can have a trumpet effect which can hinder accuracy.

    Hint:
    Before cutting the barrel. Clean it thoroughly then take an air rifle pellet, tap lightly with a hammer to splay the rear cone. Push this through the barrel with consistent pressure with a cleaning rod and feel for any slack spots. Mark the cleaning rod with a marker pen if you suspect a slack spot and repeat the process. Avoid cutting the barrel at the length of a slack spot!

    If you happen to think you have a tight spot then this would be a good point to shorten to.

    Good shooting :-)
    Dennis Groom, make every shot a good one

  6. #6
    I'm taking my HMR 452 to Paddy Dane next week to get him to check it after I had a local place shorten it and it's a lot worse than before. The current job doesn't look that great so I'm hoping he can sort it for me.

  7. #7
    I should have said. With copper jacketed bullets a taper is of no benefit. Many tests have been done and as a whole a uniform, consistent bore/groove diameter gives the best results.
    Dennis Groom, make every shot a good one

  8. #8
    nun_hunter

    Paddy should get you sorted. Get the pellet test done its simple and quick. The other important factor is a clean crown. Best achieved by grinding.
    Dennis Groom, make every shot a good one

  9. #9
    James did mine from 21" down to 16". I was VERY apprehensive as it was a lovely accurate rifle beforehand!
    However, it was the best thing I ever did as it now seems even more accurate! I never had it chrono'd either before or after, but it is ever so slightly louder now which I believe can only be a function of a slight increase in velocity. For standard subsonic loads I'd definitely recommend a 16" barrel.
    MS

  10. #10
    My HMR is 16" and shoots like the proverbial HMR laser.

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