Re: H4198 vs. IMR4198

22 October 2004, 14:50

Alberta Canuck

They ARE different powders.

BUT, so are two different batches ("Lots") of H-4198 or two different batches ("Lots") of IMR-4198. Anytime you change from one "Lot" to another, if you are running at the absolute upper edge pressure-wise, you should re-work your load.

Whether you need to do so when working at lower pressure levels is something you will develop a feel and instinct for over time. If you haven't used a particular powder long enough to really get a secure working "feel" for it, work up all loads until you "know" that powder.

Alberta Canuck

22 October 2004, 19:03

Clark

When I compare two powders to see if they are the same, I:

1) look at them

2) smell them

3) measure the density

4) test how much powder is needed for .001" extractor groove expansion.

That is how I know that Ramshot Enforcer and AA#9 are the same.

Send me a pound of IMR4198 and a pound of H4198 and I will test them.

Quote:

They were owned by two different companiesï¿½ that happened to use the same number.

Great line, Swede 44mag, can I use that?

They are canister powders now, not bulk military.

Does anyone happen to have the specifications for them?

Or are we mushrooms?

22 October 2004, 10:15

jeffeosso

Quote:

Quote:

NO!!

no two different powders are interchangable...

jeffe

Then why on earth would they give it the same number??? Specially now that they are owned by the same company.

Kory

Kory,
let's look at this
1: they were different companies for 50+ years
2: As DIFFERENT products, from different lines, they are DIFFERENT powders
3: there's 50+ years of reloading manuals that call for ONE or the OTHER, and not at the same loads.
4: blending them into ONE powder would make all those loads either 1: unsafe, or 2: under energized
5: why don't they blend anyway? can you say "product liability lawsuit"
6: one of the absolute first things listed as a "do not do" in most reloading manuals is to extrapolate loads based off relative burn rates.
7: since i redo loads for merely changing primers, there's NO WAY IN HELL i would not rework loads for a DIFFERNT powder.

in short, since these powders are simular to each other, there is a HAZARD of mixing them up. or, as you say, they have the same LAST numbers, i would suggest to you that the FIRST character is the critical issue...

I aint H...

it may become so in the future... but today, it aint
jeffe