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Thread: 357 Herrett and IMR 4227, differences between manuals

  1. 02-22-2018, 01:57 PM #21
    rosewood
    rosewood is offline
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    Quote Originally Posted by EDG View Post
    Are you aware that H4227 was renamed IMR4227 and that IMR 4227 is the propellant that was discontinued.
    No matter what you think of the data it is still your responsibility to work up a safe load.
    That was my understanding also.

    H4227 is slightly slower burning than IMR4227, therefore, using IMR4227 load data would be safe with the slower H4227. If they rebranded IMR4227 to H4227, then the IMR load data would be unsafe.

    Rosewood
    Last edited by rosewood; 02-23-2018 at 07:38 AM.
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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