Imr4227 & h4227

jimmyc

jimmyc

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Are imr4227 & h4227 the same powder?

I am looking at loading for my 8" Dan Wesson 357mag...

Most load data is for h4227, yet I did see some identical data between the two powders.

And for anyone who does use imr4227 any pet load advice?

Thanks,

Jimmy
 
No. Close but not the same.
Hodgdon's site shows IMR(11 to 13 grains) for a Hornady (Flex Tip made for penetration) FTX, H for a Hornady (HP) XTP(16.2 to 18). Not showing both powders for both bullets means they didn't test both with both. Irrelevant anyway, since you load for the bullet weight, not the shape or who made it.
Either way, your velocities will be slightly different due to the difference in barrel lengths, but note the considerable difference in powder charges and pressures.
 
So, now I wonder. Looking at my Lee manual for 357 mag rifle loads 125gr XTP loads between IMR4227 and H4227 are identical and when you look at 357 handgun loads for H4227 the data is the same aside from velocity... Same pressure, etc. maybe I should just get ahold of IMR Tech help...and Sunray, when looking and pressure differences, note that they are in CUP and PSI.

I am not so concerned with velocities of the rounds, but more to pressure and what is safe to load...

That being said, anyone have a recommendation for a 357 revolver load with IMR4227? I am open to different projectile weights.
 
If you have a can and it is marked Made in canada it is old IMR 4227 and use old IMR Data

If it is not made in Canada use H or New IMR 4227 data

Lot to lot varations is +- 5% that is why you work up loads
 
YOU CAN USE THE SAME DATA FOR EITHER POWDER


A month ago I had the same question about the same powders. The only answer I would believe is from the manufacturer so I called Hodgdon and spoke to a powder technician. He told me that although the powders are slightly different, THE DATA FOR EITHER CAN BE USED INTERCHANGABLY. ......assuming you purchased it fairly recently.

Give them a call for the same answer.
 
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