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