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300 Remington Ultra Magnum … Factory Ammunition or Reloads

Probably the most Powerful Long Range .30 Caliber Cartridge available for Target Shooting or Hunting

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I think the 30-378 Wby tops the 300 RUM a bit.


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Bro in Law has one. It was christened "Cleaver" long ago.
Rem 700. RMEF edition. Good feeling rifle that doesn't recoil as hard as you'd think, considering the hot dogs your sliding into the action.
180 Accubonds over enough Retumbo to blow a stump. Pretty well holds MOA out to 400.

They do typically "overpenetrate" a 100-200 lb whitetail...........

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You want to tame it?

You could always try 130s over a load of Trail Boss, But then you could just as well shoot them out of a 30-30.


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Maybe the Question is ... Tame the Beast or Unleash the Beast ?

One of the best things about the 300 RUM is that you can go from a 150gr. bullet with the effects similar to a 308 ( Tame the Beast ) or at the other end of the charts, use a 220gr. bullet to utilize the full effects of the 300 RUM ( Unleash the Beast )
Or everything in between ... 165gr., 180gr., 200gr. & 210gr
With powder charges as low as 70gr. to over 100gr's depending on your choice of powders.

Or you can go with some of the Factory Ammunition that's available from the top Ammunition Companies that are out there.

Choose Wisely ...

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Originally Posted by Potsy

180 Accubonds over enough Retumbo to blow a stump.


laugh laugh laugh


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That's about the thoughts I have on the 300 RUM. Too much powder for too little gain, IMO. And after shooting one, I realized even in the Remington factory stock they weren't really that bad. But if I had to pay $40-$85 for ammo, I wouldn't be shooting much. And handloading costs would eclipse the old 300 Mag by enough to make me a little pissed every time I emptied a can of powder.

All that being said, you can always find a real slow powder like H1000 and load it down a bit if you handload. As long as you have fairly full cases- not a good idea to load short loads in big magnum cases..... but then, if you're loading it down to tame it, why not send it down the road and buy something you enjoy a bit more? A 300 Mag comes to mind...

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230 grn Berger Tactical OTM ahead of 88 grns of H1000 = 2950 fps tamed to 308 recoil with a mad scientist brake by Patriot Valley. Def my pet load in the 300 Rum.


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I honestly like the rifle and the round. I think if you worked up a definition of a cross canyon elk killer it'd probably be pretty close. It doesn't jar the molars too hard (it does have a pretty huge limbsaver pad built into the stock) and it's not obnoxiously heavy. To me, it's the upper limit of what I'd care to carry and the upper limit of the long range horsepower I can accurately manage (or at least tried to). I've got one rifle with a brake, and I'll never own another, unless the brake has threads to screw my 9" SAS Arbiter on, which would be pretty awesome on a RUM.

I just don't ever see me WANTING one bad enough to buy one and I REALLY don't NEED one.

As far as taming down, either buy a suppressor, an 18 pound .300 RUM, or an 8 pound .30-06..........

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Here's a Screamer for ya …

… 300 RUM ...

Bullet - 178gr. BTHP Match
Powder - 102gr Retumbo

= Velocity - 3,300 fps … BC - .530


At that Velocity this Bullet is Screaming down range while achieving a BC that stands up against other .30 Caliber Bullets without compromising Energy at Impact.

Attached Images
beckstrand-favorite-remington-700-1.jpg (10.98 KB, 64 downloads)
Last edited by Cpl_Austin; 10/08/18.
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Originally Posted by bigsqueeze
I think the 30-378 Wby tops the 300 RUM a bit.


It is true that the 30-378 has a slightly larger powder capacity than the 300RUM, it is an anomaly that the 300 RUM shoots faster than the 30-378.
The only answer I can come up with is that the 30-378Wby is one of the worst cartridge designs ever ???

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Originally Posted by Cpl_Austin
Here's a Screamer for ya …

… 300 RUM ...

Bullet - 178gr. BTHP Match
Powder - 102gr Retumbo

= Velocity - 3,300 fps … BC - .530


At that Velocity this Bullet is Screaming down range while achieving a BC that stands up against other .30 Caliber Bullets without compromising Energy at Impact.




DANG, but that's a lotta powder to only gain 100 fps over the .300 Weatherby...……………………...


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I've never owned or shot a 30-378 so I can't comment on it but I have read about it's History and it's effectiveness so I'm sure there are those out there that would be qualified to give some good information on it.

From what I've read about the 30-378 it sounds like it's a very effective Cartridge.

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Originally Posted by Yoder409
Originally Posted by Cpl_Austin
Here's a Screamer for ya …

… 300 RUM ...

Bullet - 178gr. BTHP Match
Powder - 102gr Retumbo

= Velocity - 3,300 fps … BC - .530


At that Velocity this Bullet is Screaming down range while achieving a BC that stands up against other .30 Caliber Bullets without compromising Energy at Impact.




DANG, but that's a lotta powder to only gain 100 fps over the .300 Weatherby...……………………...


And roughly 20" more 10mph drift at 1000 than my little 7mm RM with the 180 ELD-M started at 2915 using 67.0 grains of RL26. For example/discussion only. But yeah, that 300 Rum is a cannon for sure.

Last edited by MtnBoomer; 10/10/18. Reason: Don't use 76 grains!

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Originally Posted by boatanchor
[quote=bigsqueeze].
The only answer I can come up with is that the 30-378Wby is one of the worst cartridge designs ever ???



Bad enough to have held the 1000 yard BR record for...…….like...……..about 3 decades, bad.

Yep.


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Here's a great Boulder Splittin Load for ya …


… 300 RUM …

Bullet - 200gr. NOS AB

Powder - 95gr. Retumbo

= Velocity - 3,000 fps

It carries that EFP all the way out there ..

Nuthin like hearin it CRACK! ... when it hits that Boulder out on the Ridge …

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Trying out another Load …

… 300 RUM …

… Bullet - 150gr. FMJ/BT

… Powder - 82gr. H4831sc

= Velocity - 3,150 fps


Should be a great 200yd + Hole Puncher

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I have a 7mm ultra mag. It doesn’t have the recoil you would think it would either. I guy on my lease bought a 300 this year. He said recoil isn’t bad also.

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That was excactly my quest this summer. I built two 700 300 Rums and shot a wide variety of factory and reloaded ammo. One can find great deals on Rum factory but the wealth of reloading data prevailed. Just got home yesterday from a backback Bull hunt 6 miles in and going to retrieve the hanging quarters with my mules tomorrow. Was dialed in totally confident with a well proven and documented Rum load. Search 200 Accubond 300 Rum. For some reason one of those forgiving bullets for a Rum and drop dead performance for me. Very stoked to find my best long range results and hunting loads as follows . Norma brass, 92 grains Retumbo, 200 grain regular Accubonds, 3.66 OAL with Win mag primers. Federal mag primers performed about the same but last days shooting too 600 the win primers a tad more consistent and I was surprised because the Federal primers were match grade. I did have both 26 inch barrels threaded for brake, took on and off when target shooting the two and hunted with the brake. Very sweet, have fun!

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Originally Posted by Yoder409
Originally Posted by boatanchor
[quote=bigsqueeze].
The only answer I can come up with is that the 30-378Wby is one of the worst cartridge designs ever ???



Bad enough to have held the 1000 yard BR record for...…….like...……..about 3 decades, bad.

Yep.


If your referring to the one of about 3 and 3/4" shot by Earl Chronister at Williamsport in the mid 80s, it actually it only held for about 2 years, and theres never been another with that cartridge.

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