Does anyone know what # extruded powder that Rem uses in their factory Core-lokt loads? This round is very accurate for me and I would like to duplicate in my reloads. Comments / suggestions.
Thanks in advance.

JR Smith:
I didn't see what caliber you are interested in
but in 7mm rem mag I believe IMR7828 is the powder
used by Remington in the 150 & 175gr core-lokts.
I had the same question a while back and some of
the other poster's said that IMR7828 was used
in development of 7mm rem mag factory loads. I also have found these core-lokts to be extremely
accurate in the 150gr load and hard to duplicate
their accuracy with hand loads. Good luck if you
are trying to achieve a better load! BLR7

BLR7, i AM TRYING TO DUPLICATE 100 GRAIN .243 REM FACTORY LOAD. I HAVE A SINGLE SHOT RIFLE THAT WILL SHOOT SUBMOA WITH THESE ROUNDS. THANKS IN ADVANCE JRSMITH

I have always been told that all the larger rem factory loads were imr 7828.
I personaly use 7828 for all my 300 ultra mag.
and love the consistant reliability.

300 ultra mag.
federal match gm210m
97gr. imr 7828
125 nosler part.
total lenght 3.580
extreamly acc.

It changes and like as not there will be no equivalent. I asked the various companies what powder they used in their 6mm rem rounds. Most of them changed powders periodicaly.

JR,

Disassemble a cartridge and weigh the powder charge. We'll try to suggest a possible powder that it may be...

Obviously check published data for the powder you think they are using, and don't go over that amount.

If Remington has a relationship with IMR, (for the 7828), my guess is that they are using either 4350 or 4831 for the 100 grain factory loads (if in fact you're looking at an extrude).

For the 4350, you'd likely see a charge of around 37.5 to 38 grains. For the 4831, 40 to 40.5 grains. These would be quite warm loads, but that's the way the factory loads generally are...

If you see more than 41 grains of powder in the case, you'll be looking at a slower powder than 4831.

I'm betting it's IMR 4350...

Dan

i pulled bullets of 243win factory rem. ammo. 80gr bullet. Looks like Imr4350, the gr. weight of the powder was in the correct range also.

I PULLED A LOAD AND IT WEIGHED 41.7 ON MY RCBS SCALE.

OPIE I BET THAT 97 GRAINS IS A BLAST!!!!

41.7 grains would be a considerable step above IMR's max for the 4350... And certainly warm for 4831, but that's what I'd expect.

According to Nosler's number 5, IMR 4831 in a 42.0 grain charge (MAX) is their most accurate load with the 95 to 100 grain bullets.

Work up carefully toward 42 grains of IMR 4831 and see if that doesn't do it for you...

Best of luck, and let us know what you discover...

Dan

Heed 1894's post.

Manufacturers can't always "duplicate" their own loads, as ammunition lots vary in velocity and performance, so what makes you think you can?

Manufacturers use various NON CANISTER grades of powder in their ammunition, and their formulae change from time to time as their component sources change.

Remington used to have a relationship with Du Pont when Du Pont produced the IMR powders. That doesn't necessarily carry over today. Whatever you find in a factory load, it may or may not be an IMR product and may or may not be substantially similar to an available canister powder.

Except for the "High Energy" loadings, manufacturers normally tend to use a powder in the faster end of the acceptable range, since it takes less faster powder to acheive the desired velocity range than it does a slower powder. Less powder equals lower manufacturing cost. Five or six grains of powder may not seem like much, but over a manufacturing run of several hundred thousand rounds may amount to several thousand dollars in savings.

Work up a good-performing load for your rifle using an appropriate powder (and the factory bullet, if you like it) and don't worry about making a factory "duplicate.

JR SMITH:
Remington published specs for the 100gr cor-lokt
is 2960 fps. Take a look at "Modern Reloading"
by Richard Lee page 213 and you will find several
powders listed in that velocity range. Take a look also at the listed pressures and minimum
overall cartridge lengths(OAL's) indicating
different bullet types (designs) in the same
weight different seating depths. If you have some
factory loads handy, take a measurement of several cartridges overall length (OAL) and notice the differences in cannelure exposure at
the crimp. You can get an average OAL average for the cor-lokt 100gr bullet and remington case.
Trim your fired cases to minimum. Try some of the canister powders recomended and start at the low
end weight and work up slowly. You may have to try several powder types before finding the most accurate load for your rifle. You may also find
a load that is more accurate and smoother shooting than factory loads. All of this is done
for us with factory loads that will chamber in
all types of rifles from single shot to semi-auto and still deliver accuracy and reliability. I can
only guess at which powder Remington uses for a
certain lot of ammunition but I know I could a
load my own and enjoy the end results a lot more!
I think that's what reloading is all about! BLR7

Hey JR, Welcome to the Board!

Go back up and re-read Stonecreek's post a couple of times cause it is dead-on-the-nose.

The suggestion to take a Factory Load apart, weigh the powder and try to determine what it is by it's looks is pure loonacy! It can cause you to draw the wrong conclusion and end up getting into catastrophic Pressure Problems.

Just look in your Component Manufactures Load Manuals for the powders that appear to be the most efficient in your cartridge with that specific bullet weight. Then Develop the Load from below as suggested in the same Manual and you will do fine.

When you decide you want to spend a bit of time "fine tuning" your Load, use the original (non-Rookieized) Creighton Audette Method.

Best of luck to you!