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Old 04-18-2017, 10:44 AM
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Mr_Flintstone Mr_Flintstone is offline
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Default IMR 4227 Question

I bought some IMR 4227 for reloading .30 carbine, but I found it useful for .357 magnum as well. A friend recently gave me a half-box of .38 special 200 grain super-police ammo, and I want to reload some more of it. I found data in the Lee 1st ed. manual, but I'm a little confused. Hodgdon told me that new IMR 4227 and H4227 load data should be essentially the same, but to start at the lower end and work up. The data I found for this round, though, lists H4227 at 7.9-8.5 gr, and IMR 4227 at 8.3-9.2 gr. The only other manual that I could find anything close in was the Lyman #44 manual that lists 7.0-9.5 gr for 195 grain. Either way you go, that's a pretty big range to work through. Would it be safe to assume that 8.3 grains of IMR 4227 would be a safe starting point since it's the minimum for IMR 4227 and below the max for H4227?

Last edited by Mr_Flintstone; 04-18-2017 at 10:45 AM.
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