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Old 11-23-2007, 11:35 AM   #1
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Remington's .300 Ultra Mag Reduced Loads

Hello. A recent Shooting Times article covered Remington's new commercial ammo offerings in reduced loads utilizing the .300 RUM case (.404 Jeffrey).
The options are full house RUM load, reduced load equal to .300 Win Mag and lastly reduced load equal to .30-06 ballistics.

The article further notes bullet weights for each and nominal ballistics.
Remington achieved this by altering the powder type and weights.

My question is: Does anyone have an idea as to what type powder(s) and quantity could be used to achieve the .30-06 variant? A 150 grain bullet is loaded in their 06 variant and achieves approx 2910 fps at the muzzle.

I have previously used H-1000 in my RUM, but assume that powder will be a tad slow burning for something like the .06. I have used IMR 4064 for 06's. Just not sure of how much in that big RUM case, or if it would make a difference, i.e. simply load a recommended 06 powder quantity in the RUM case??? I don't know enough about pressure changes and case dimensions to jump right into attempting this at the moment.

The article emphasized increasing the versatility of the RUM by being able to use these alternative loads. My guess is that a box of the 06 variant (in the standard RUM case) will be quite a bit more expensive than a regular box of .06, hence my interest in reloading my existing RUM cases to this power.

Thanks.
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Old 11-23-2007, 03:20 PM   #2
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I beg the question...why? If you want to load to 30/06 or .308 why get a 300 RUM in the first place?
I add:
If I was to load a 300 RUM to aught six velocity I would use RE-15 and a 150gr pill lit with a std primer.
If I was to load a 300 RUM to .308 velocity I would use IMR-4064 and light it with a mag primer...lotsa unused space inside the cartridge and the mag primer will help make-up the void and allow all the granules to light within the first third of the barrel
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Old 11-23-2007, 04:12 PM   #3
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I don't see why there would be any problem with using something like H4350 in there. Probably 55 grains behind a 190 SMK would be good. I always use magnum primers. Can't think of a reason not to.
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Old 11-23-2007, 07:24 PM   #4
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Manufacturers never tell what powders they use and it is very likely that are NOT using cannister powders available to us.

Perhaps a more logical approach would be to look at RUM loading data. Remington uses a 150 in their 06 equivalent load so the best place to start might be with STARTING loads for that weight.

Most manuals use an abitrary reduction from max for that either a percentage of just "X" number of grains. As long as we're talking about extruded powders a small reduction is not harmful. 4350 and 4831 come close to 06 velocities at the start level so a couple of grains less will probably be close, but if you don't chronograph you'll never know.

Magum primers are never a good idea for this type of load and are rarely beneficial or needed with extruded powders in any cartridge. Usually they give more erratic velocities and accuracy.
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Old 11-23-2007, 08:54 PM   #5
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Thanks for the replies. I own two .30-06 rifles and also a .300 RUM.
At this point I'm doing a little wargaming to see what others think about powder types and such.
The article did specify 150 grain bullets in the 06 load.
Regards
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Old 11-23-2007, 10:55 PM   #6
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Quote:
Originally Posted by Charlie Petty

Magum primers are never a good idea for this type of load and are rarely beneficial or needed with extruded powders in any cartridge. Usually they give more erratic velocities and accuracy.
So do you consider Winchester primers that say "For Standard or Maximum loads" standard or magnum primers? I figured since they only make one kind it wasn't a big deal. I have never noticed a difference but I have not got to use my chronograph much and I am usually just plinking so accuracy wouldn't stand out either.
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Old 11-24-2007, 09:15 AM   #7
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IMX the Winchester primers are sorta in between. They are hotter than most "standard" primers but not quite as hot as most "magnum" primers.

I treat them like standard primers but do not use their rifle primers anyhow.

I've actually done quite a bit of testing of standard vs magnum primers and the only time I found them to be beneficial was in large cases with slow burning ball type powders. When they are substituted in more conventional loads they seem to increase velocity spreads and sometimes degrade accuracy.

Unless a specific recipe calls for them I don't use them at all.

And, since they cost more, they are often a waste of money.
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