I run Hunting loads of .44 mag. 225 Gr. in excess of 22.5 Gr. IMR 4227 , It's identical with Win 296 ,although I or MY pistol prefers IMR for accuracy . It's funny peculiar how different loading manuals list different Maximum loads .
IF I jump up to 240 Gr. pills then Max load is 22.5 Gr. with IMR 4227 and again ditto with 296 powder .
Now old Hercules now Alliant 2400 was Maxed at 21.0 Gr. with 225 Gr. bullets . And 19.5 Gr. with 240 Gr. bullets
I want to caution anyone using this data ,as it's OLD SCHOOL and REFERENCE ONLY . I shoot OLDER powders and have Guns which are Safe to shoot it in . Model 629 6" Dirty Harry studio collector and MY Ruger Redhawk hunting pistol . The Blown one ISN'T or WASN'T mine !.
Where I see some folks getting into trouble is substituting PRIMERS , MAGNUM cartridges REQUIRE magnum Primers ,unless duly noted by a reputable reloading manual .
Changing primers can result in SERIOUS burn rate alteration of the pressure curve and can be DEVASTATING !. See Photo .
As I batched early in My career for Hercules Powder mainly industrial division but also sporting powder production ,I've seen a thing or two .
The #1 REASON powder Companies published loading data ,was to ensure customers SAFETY and they didn't spend Millions of dollars doing load development pressure testing and powder selection , So customers would decide for themselves what amount of powder works best in a particular cartridge case ,with whatever bullet weight they had on hand .
I personally witnessed a MAJOR malfunction on the Trap line one evening ,where a fellow shooter /reloader made his own recipe apparently . Sadly we'll Never know WHY ,as he was KILLED and the shooter next to Me took barrel shrapnel which saved MY Butt . I knew George Well and he had just purchased a New sweet O/U and must have mixed up recipes ,using the wrong powder or had flash over of too little powder ?. Police labs NEVER released any pertinent information regarding that aspect of the investigation .
Flash over explosions ARE REAL . I'll post more on that IF anyone is interested in the appropriate venue .