Dupont IMR

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NedwardFlanders

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I just bought a Lee Loader and the data card has load data for Dupont IMR powders. Looking around it seems the Dupont name isn't around anymore and has just become IMR.

So, I just wanted to make sure that the modern IMR powders are the same as the Dupont IMR powders of the same number and I can use the loading data for the Dupont IMR powders safely.
 
there might be a few changes I know of 2 or 3 ... so prob more

Check out .... for new data

ht tp://www.hodgdonreloading.com/

Unless you have Cans of powder that are marked Dupont
 
One of limitations of Lee Loader is that you load with a scoop - there is no "working up" a load unless you buy a set of scoops in different sizes and use table in the Lee loading manual. I loaded hundreds, maybe a thousand or more, rounds of 308 Win with a Lee Loader, without a hiccup, in mid to late 1970's. Neighbour decided to do the same - froze his bolt shut on his first 22-250 "re-load" - would not 'fess up to what he did differently than the instructions said.

OP, your scoop either has an ID number or a "CC" volume stamped on it. Your data card refers to that scoop. If you get a loading manual, can compare what your scoop is delivering / what the card is listing to see if it is a start, middling' or "hot" load.
 
The addition of a scale would help you a lot. Not expensive and you could use the start data supplied in the various manuals and work your way up.
 
I'm thinking a scale may be the easiest way to go, since I'm going to need one anyways when I eventually upgrade my kit.

In the meantime I emailed IMR asking if my 2.8cc dipper will have the same characteristics with IMR 4350 and Dupont IMR 4350.
 
NedwardFlanders said:
I'm thinking a scale may be the easiest way to go, since I'm going to need one anyways when I eventually upgrade my kit.

In the meantime I emailed IMR asking if my 2.8cc dipper will have the same characteristics with IMR 4350 and Dupont IMR 4350.
Click to expand...

Powder lots can vary By 5% so if you have for example
Lot 1 could be on the low side of the target value .... it still meets Specs so it is ok
Lot 30 could be on the High side of the target value ...it still meets Specs so it is ok

if you compare Lot 1 to Lot 30 the difference is 10% .... 5% high and 5% low

this is why all of the reloading manuals tell you when you change something reduce your load 10% and work up
 
NedwardFlanders said:
I'm thinking a scale may be the easiest way to go, since I'm going to need one anyways when I eventually upgrade my kit.

In the meantime I emailed IMR asking if my 2.8cc dipper will have the same characteristics with IMR 4350 and Dupont IMR 4350.
Click to expand...

The parent company changed, but the powder is the same. - dan
 
General Dynamics, an American company, makes IMR powders among others, including the Dominion line of powders. Their IMR plant is located in Quebec. Hodgdon relabels and packages their powder but does not manufacture it. Hodgdon powders are made by a variety of companies from all over the world.
 
Remington/Dupont and Winchester/Olin are no longer with us and these companies split up. "BUT" the standards for making IMR or Improved Military Rifle Powder remain basicly the same.

The real problem is there are two types of Lee powder scoops, some are listed as cc or Cubic centimeter and some are given reference numbers.

I have the older red and black scoops with reference numbers and newer yellow scoops in cc.

LEE Dippers: Old (Black or Red) powder dippers vs New (Yellow) powder dippers
http://castboolits.gunloads.com/showthread.php?258428-LEE-Dippers-Old-(Black-or-Red)-powder-dippers-vs-New-(Yellow)-powder-dippers

attachment.php
 
IMR emailed back:

"We do not trust the dippers unless you can check the weight being thrown by the dipper. Density of powder will vary from lot to lot which means sometimes the dipper throw high charges an sometimes the charges are thrown lite. I would suggest you purchase a powder scale which can be used to check the amount of powder measured by the dipper."

Didn't really answer my question, but if I guess I'll just buy a scale before using IMR powders.
 
You should have a scale to check ALL powders, not just IMR.
Or get a combo thrower and scale ie, RCBS chargemaster.
Then throw that lee dipper as far as you can..
 
bigedp51 said:
Remington/Dupont and Winchester/Olin are no longer with us and these companies split up. "BUT" the standards for making IMR or Improved Military Rifle Powder remain basicly the same.

The real problem is there are two types of Lee powder scoops, some are listed as cc or Cubic centimeter and some are given reference numbers.

I have the older red and black scoops with reference numbers and newer yellow scoops in cc.

LEE Dippers: Old (Black or Red) powder dippers vs New (Yellow) powder dippers
http://castboolits.gunloads.com/showthread.php?258428-LEE-Dippers-Old-(Black-or-Red)-powder-dippers-vs-New-(Yellow)-powder-dippers

attachment.php
Click to expand...

note that the red dippers are in cubic inches (i.e. 205 red dipper is 0.205 in3). I have both the red set and the yellow set. Love them and use them for about 75% of all my reloading. Trailboss, Universal, and other flake powders don't work in my AutoDisk. Ball powders for rifle are also great with scoops - Winchester 760, AA2700, Winchester 748 etc.
 
The dippers are great to get you close to the charge weight you want. I use them for my precision reloads. Scoop out a slightly light powder charge, dump it in the scale pan. Then trickle up to the desired charge weight.
Just the technique you use when scooping powder can change your results significantly from charge to charge.
Like others, I'd suggest buying a good scale. I prefer beam scales for their simplicity and lack of anything electronic.
 
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