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

[Larry7293]

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

[Outpost75]

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.

[challenger_i]

My manuals show IMR 4227 in 45 Colt, but for jacketed only.

[Larry7293]

Henry rifle 38-55win .

[P Flados]

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.

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 !

[Larry7293]

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

[P Flados]

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.

[RayinNH]

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.

[Bulseyetom]

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

[Larry7293]

thanks