Is IMR 4831 and H 4831 the same powder.I am havine a hard time finding the IMR in my area.

quote:

Is IMR 4831 and H 4831 the same powder

NO....similar maybe but do not use one for the other. Use data as prescribed and do not mix or substitute.

NO! They are NOT the same powder. IMR-4831 is a bit quicker and will have lower powder charges than H-4831 will.

They are used in about the same rounds though..........................DJ

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NO

IMR 4831 burns several grs hotter than H4831. While you could use H4831 powder and IMR data you can't go the other way.

To keep it safe I only use matching data.

I used IMR & H 4895 and mixed up the measurement

. In other words screwed up . I was how ever lucky and had no ill effects .

I agree with VapoDog , it's not worth screwing up . They are not the same yet similar !.

You can in most cases use either powder for the burn rate is very close . Just use the prescribed amount for the particular powder in which you use . Consult a reloading manual. On line go to

http://www.hodgdon.com/

Shoot Straight Know Your Target . ...

I believe you misunderstood what I said .

So let me clarify it for you . The Burn rates are similar NOT EXACT !. Consult a burn chart and tell me how far apart they are !.

Next I said to use loading data for one or the other but DON'T Mix them up . Lastly I said to consult a loading manual Didn't I !.

" Just use the prescribed amount for the particular powder in which you use . Consult a reloading manual. " On line go to
http://www.hodgdon.com/


Shoot Straight Know Your Target . ...

DrK , Original question was refering to 4831. You typed 4895.

Typo?

The really interesting part is that I once read a purportedly authoritative source which said that although the two are not the same burn rate, if you saved the IMR powder 20 years or so, it would change to the same burn rate the H-4831 is now.

Presumably that theory was based on off-gassing of solvents, deterioration of some of the chemical content, etc.

Personally I don't believe it likely to be true, but it WAS an interesting statement.

The story that I read was the original powder marketed by Hodgdon was WWII IMR4831 manufactured for the Oerlikon 20mm cannon. Hodgdon bought it and marketed it as "4350 data powder" even though it was slower than 4350. It was eventually called 4831.
Its burning rate was also slower than "IMR4831 reintroduced" in the 1970s or 1980s. After all of the WWII surplus was finally used up Hodgdon contracted to have new H4831 manufactured and the canisters were marked "Newly Manufactured".

GSP7 : Yes I did didn't I !. That's because it's the powder in which I used to make my mistake !.

It still doesn't change anything else . 4831 either IMR or Hodgdon is still very close to the same burn rate . There for either one could be used with respect to it's own loading formula .

I would never recommend anyone substitute a particular brand of powder and use the other brands powder loading formula !. That's stupidity in action !.

Even if it made no difference I will never tell someone else it's OK !.

Albert ;is on the correct mind set !.

Many many people are under the misconception every powder is made by a different manufacturer .
Simply untrue , some of the packaged powders are not even made by that company !. Some powders are Exactly the same formulas !!!.

Then some are slightly different . Be assured of this , if a brand of powder ( packaged Canister type ) is sold in the USA ; It has signature elements tracers if you prefer , that make it identifiable to authority's !.

Some of which can and do affect burn rates as well as stability . Several types of military powder are in fact re labeled / with tracers as Brand A , B , or C , gives us all more stuff to buy !.

Think of it this way if I'm confusing anybody . How many firearms brand wise , are produced by another company and sold under another company's name ??.

Sorry ; Ray M ; It wasn't my intention to be hostile . The actual burn rates are VERY Close in either brands of 4895's and 4831's respectively that is .

If ones comparing say Norma R-1 too IMR 4227 NOW that's not even close !.

Does the caliber in question show loads for both powders in 4831 ?. I then rest my case .

Shoot Straight Know Your Target . ...