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Thread: Looking for loading data for a 255grn rnfp bootlit using IMR4227.

  1. #1
    Boolit Bub
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    Looking for loading data for a 255grn rnfp bootlit using IMR4227.

    I am having a hard time finding any reloading data for a 255grn rnfp bootlit in win38-55 -Henry rifle- using IMR4227. I called Hodgdon and they could not provide any information.
    thanks
    Last edited by Larry7293; 04-02-2024 at 07:33 PM.

  2. #2
    Boolit Grand Master Outpost75's Avatar
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    In what caliber? For which rifle or revolver?

    4227 is too slow burning to work well in .45 Colt.

    Lyman has 4227 data for .454 Casull.
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  3. #3
    Boolit Master challenger_i's Avatar
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    My manuals show IMR 4227 in 45 Colt, but for jacketed only.
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  4. #4
    Boolit Bub
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    Henry rifle 38-55win .

  5. #5
    Boolit Master
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    This is not load data, but should give you some idea of what to expect if you are inclined to work up your own load.

    I adjusted a RCBS 250 FN to weigh 255, and picked an AOL for a 0.625" seating depth.

    Code:
    Cartridge          : .38-55 Win.
    Bullet             : .375, 250, RCBS FN GC 37-250-FN
    Barrel Length      : 20.0 inch = 508.0 mm
    Powder             : IMR 4227
    
    CAUTION: Figures exceed maximum and minimum recommended loads !
    
    Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
     %       %    Grains   fps   ft.lbs    psi    psi      %        ms
    
    -15.9   64    18.50   1350    1032   15729   2414     85.8    1.922
    -13.6   66    19.00   1383    1083   16732   2501     87.0    1.868
    -11.4   68    19.50   1416    1135   17787   2586     88.2    1.816
    -09.1   69    20.00   1448    1188   18896   2670     89.3    1.766
    -06.8   71    20.50   1481    1241   20050   2752     90.3    1.719
    -04.5   73    21.00   1513    1296   21287   2833     91.3    1.674
    -02.3   75    21.50   1545    1352   22574   2911     92.3    1.631
    +00.0   76    22.00   1577    1408   23926   2988     93.1    1.590
    +02.3   78    22.50   1609    1466   25349   3062     94.0    1.550
    +04.5   80    23.00   1640    1524   26844   3134     94.7    1.512
    +06.8   82    23.50   1672    1583   28415   3204     95.5    1.476
    +09.1   83    24.00   1703    1642   30066   3271     96.1    1.441  ! Near Maximum !

  6. #6
    Boolit Bub
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    I will start with 18.5grn and go from there. Where did you get this information? thanks

  7. #7
    Boolit Master
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    Quote Originally Posted by Larry7293 View Post
    I will start with 18.5grn and go from there. Where did you get this information? thanks
    It is a Quickload prediction. Predictions do not always match up well with actual published pressure test results.

    However, if you have a chrono, and your loads match up with predicted velocities, then the pressure prediction info is probably pretty reasonable.

  8. #8
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    Larry, Ken Waters tome "Pet Loads" complete volume, lists 18 grains with Lyman bullet 375248, approximately 249 grains. He used Remington 9 1/2 primers, velocity 1340 fps. This load is for weaker action rifles, all Ballards, Stevens 44's & Tip Ups, Colt Lightning and Marlin 1881 Repeater.

    This was the only data with that powder for the 3 action strengths that he provides data for. Page 451 if you can lay your hands on the book.
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  9. #9
    Boolit Mold Bulseyetom's Avatar
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    I looked in my old Lyman manual from around 1950 and it shows 17.0 grs of 4227 @1375 for boolet 375248 (250 grains) and 18.0 grains of 4227 for #375296 (265 grains). Tom

  10. #10
    Boolit Bub
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    thanks

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check