IMR-4198 vs H4198

[duckey]

Been looking at load data in the Lyman cast bullet handbook 4th edition for my .30-06, 30-30 and my .375 H&H. They list IMR-4198 for all three of these calibers. I found some H4198 on sale, but am uncertain if this powder is the same or near same as IMR-4198

[Outpost75]

These days it all comes out of the same barrel, all made by ADI in Australia.

If you have older IMR which is Expro product, made at Valley Field, P.Q. it says Made In Canada, and is different from Hodgdon.

If you have VERY old (pre-1976) IMR which says DuPont on the label, made in Kearny's Point, NJ, that is different still.

[duckey]

Ok. Thanks. I saw your post back from 2014 regarding using 12-13 grains of Bullseye, red dot and also 700x for cast .375 and you stated it was a nice round to shoot and also get some jerky meat with. I have plent if Bullseye, some red dot and a small amount of older Unique so I may try it out. Any idea on velocity? Trying to use powders I have on hand, safely for my .375

[Outpost75]

In the .375 with #375449 12 grains of Bullseye is about 1150-1200 fps and 13 grains 1250-1300, depending on barrel length. No GC or filler neexed.

[Moleman-]

I've got all three right now. Yellow can of DuPont, burgundy can of IMR, and current plastic jug.

[Ballistics in Scotland]

These days it all comes out of the same barrel, all made by ADI in Australia.

If you have older IMR which is Expro product, made at Valley Field, P.Q. it says Made In Canada, and is different from Hodgdon.

If you have VERY old (pre-1976) IMR which says DuPont on the label, made in Kearny's Point, NJ, that is different still.

I'm sure that is all true, and it may be that slight differences in behaviour may be identifiable with the earlier versions. I suppose it is just possible that there is some gross overload level in which one would cause a firearm to fail and the other wouldn't. What I don't believe is that either of those very reputable companies would sell a powder under a name which posed a danger of misadventure if handled within the limits of reloading manuals or good practice in working up a load.

All smokeless powder production varies somewhat in its behaviour. Military arsenals and mass-producers of cartridges accept this, test the each very large batch of the stuff, and allow for variation by adjusting the load. When the powder companies sell it as canister powder they accept the greater cost (and the retail customer does) of testing it, and if it varies from expectation either relabeling it as something else, or returning it to process for remanufacturing. I think these companies would get it right.

[dkf]

I use IMR4198 bu tI have data for both. Data is close but not the same for the IMR vs the H. If you start low and work your way up it should not matter, the two are close enough.

[duckey]

dkf

does H4198 have load data for a Lee .379-250 gn plian base?

[honus]

dkf

does H4198 have load data for a Lee .379-250 gn plian base?

21.0 grains of H4198 gave 1515 fps average out of my 30" 38-55.

[M-Tecs]

At one time IMR-4198 was slightly faster than H4198. Some claim that the current production stuff is the same burn rate. I don't know, but, if you are using IMR data and substituting Hodgdon powder you won't have any issues. I would not recommend using Hodgdon data and substituting IMR powder without reducing the load slightly.

[Michael J. Spangler]

Everything I've read says they're not the same powder. I would be careful subbing one for the other.
I remember a thread a few years back where someone read IMR and loaded with H or the other way around.
He ruined his 1895 and some of his hand.

[lotech]

Call Hodgdon; they can confirm whether the powders are the same.

[duckey]

Think I'll just go with the IMR4198, fyi to all....BPI has H4198 on sale fir $19.99 for one pound containers, marked diwn from $27.99