300 Remington Ultra Mag


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xringer3
February 24, 2008, 03:39 AM
Hello fellas. I'd like to hear from the guys shooting the 300 Remington Ultra Mag. I just picked one up on a heck of a deal, and since I'm going to Colorado this year, figured I can take just about anything from antelope to elk, whichever I'm going out for.

I'd be interested to know from the reloaders if there is anything out of the ordinary to be cautious of or to do. I've been reloading everything for almost 30 years, so it's not new to me. I just never loaded a cartridge this big. I'd also be interested in any experience or experties people have from using this cartridge.

Thanks.

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Matt304
February 24, 2008, 01:10 PM
Just get a book and follow load data.

There is nothing special about it, besides that it is a little bit overbore.

Strongbad
February 24, 2008, 01:29 PM
Matt said it right. Loading for the 300 RUM is straight forward. No surprises. It's a solid performer with good accuracy. I've got one and a good friend of mine also has one and both are very accurate.

Bartkowski
February 24, 2008, 01:36 PM
A friend of mine goes to Colorado every year and he uses one. He shot an elk 411yards away according to his rangefinder. Obviously it will work on antelope, but you are going to have a lot of meat damage.

Harley Quinn
February 24, 2008, 02:09 PM
Here is some data you might find interesting, I did.

http://leveron.com/john/300rum/300rum-text.txt

The thing about this caliber is "Magnum" and to get those results you normally need to reload it hot, not that you can't reload it not hot, but you need to experiment a little with what your rifle will shoot best and the groups it will shoot.

Best to experiment before you go, Lighter bullet dense would be the way to go for the antelopes and the heavier bullet semi dense and and mushrooming would be my thought for the Elk.

http://www.chuckhawks.com/300super_mags.htm

But the day of the dense lead is not going to work in this one :D

dakotasin
February 24, 2008, 02:31 PM
retumbo and barnes 165's and go forth and kill w/ confidence.

rl-25 will work, but you might find it just a tad fast, as w/ h-4831, but both might work well for you. haven't tried anything else. have had good results w/ rl-25 and excellent results w/ retumbo.

mtmuley
February 24, 2008, 06:15 PM
I've been loading and hunting with the .300 RUM for 6 years now. I've used lots of different bullets and powders in load developement. The RUM isn't real hard to load for. I have several recipes that will shoot 1 inch to 3/4 inch all day. But, I found with the horses the RUM has, a slightly heavier bullet is the ticket. Specifically, I use the 200 gr Accubond, and have since it became available. My Remmy BDL will shoot 1/2 inch at 100. Consistently. With a bc of .588, and attainable velocities of 3200 fps+ (mine averages 3200 with RL-25) it is an elk killing SOB. And deer, and bears and antelope. Yep, I hunt antelope with the 200 gr Accubond. I have taken about 30 critters so far with this cartridge and bullet. Ranges from 40 to 686 yards. Overkill sometimes, unless you need it. In my estimation, it is the best of the "big" .30's. PM me if you would like. mtmuley

xringer3
February 24, 2008, 07:29 PM
Thanks alot guys, all of your information is exactly what I was looking for. I love to reload and to me, tinkering with the different bullets and powders to find that "majic sweet spot" load is most of the fun! I figured the really slow powders like retumbo or rl25 were gonna be my best bet, thanks for confirming.

Has anyone tried the Barns 130TSX in this caliber. I'm under the impression that it will hold together and shoot extremely flat if the rifle will group it well. Since it doesn't have a lead core and penetrates like a heavier lead core bullet, I figured it for the antelope load.

Thanks again all, you've been a big help!:)

jmr40
February 24, 2008, 07:46 PM
I noticeed that Remington loads this round to 3 different power levels and advertises the gun as the perfect all around gun. Power level 1 is loaded to 30-06 velocities, powerlevel 2 is loaded to match the 300 win. mag, and power level 3 is the hottest load.

xringer3
February 25, 2008, 12:01 AM
Yea, I saw those different loads. It makes for a very versitle rifle, but I can't let the wife know about it. She will think I only need one rifle!

MachIVshooter
February 25, 2008, 02:32 AM
I'd be interested to know from the reloaders if there is anything out of the ordinary to be cautious of or to do.

Bullets under 180 grains will not perform well at .300 RUM velocities, so stick to 180 & heavier. Slower powders work best with the RUM's.

Harley Quinn
February 25, 2008, 11:19 AM
I noticed that Remington loads this round to 3 different power levels and advertises the gun as the perfect all around gun. Power level 1 is loaded to 30-06 velocities, powerlevel 2 is loaded to match the 300 win. mag, and power level 3 is the hottest load.

It has been stated the 180 and above are best in this shooter! Yes that was why it was designed for the heavier bullet at as fast a speed as can be obtained. But the speed of the 270 or 06 can also be used in the lighter bullets as mentioned in the above post.

Reason for this round is...versatility to be able to do what the 06 could and more (heavier bullet faster speed).The only real test is to load and practice and find a few loadings that suit you and use them. Your rifle will speak to you just watch the results. :)

HQ

GooseGestapo
February 25, 2008, 11:56 AM
Although "mega-overkill" for most purposes, it's a great cartridge. Sorta like a scaled up .223Rem.

I've used most of the appropriate powders and have found that the original application I obtained the rifle for to be the best.

Like you, I got my .300RUM on the cheap as the rifle was used, at a pawn shop and wouldn't sell due to the cost of the ammo. I deliberated on getting it for a long time. I fianally got it and I've been pleased with it.

My favorite load (rifle's too) is really a suprise. I've found that the best all-around powder for 180gr and heavier bullets is the WC-860 surplus .50BMG powder I obtained from Widners for $50 for 16lbs !!!

With neck-turned "match prepped" Remington brass and Fed 215 primers I'm getting 3,350fps from 107.0gr. This noticeably exceeds the factory ammo in many cases (claimed 3,250fps). Best accuracy has been with 105.0gr for factory duplication, and with the "garden variety" Remington 180gr Remington Corelokts. This bullet IS in fact suitable for this cartridge based on my "example of ONE" in its application on a 120lb doe I blasted with it at the great range of 40yds. The bullet held together and completely penetrated the torso of the deer on an intended raking shot to see if it "would" hold together. It performed in an exemplary fashion.

I've also tried the other "suitable powders" from H4350 thru "Retumbo". My personal favorite amoung these was/is Reloader 25. Retumbo is defintely the velocity King, but RL-25 is slightly more accurate and versitile.

If going for Antelope, I'd either use the aforementioned 180gr Corelokt, or the 150gr Corelokt or 150gr Nosler partition. RL-25 is much faster than the WC-860 with the 150's giving over 3,500fps (about like shooting 55gr bullets in the .22-250). A full case of WC-860 gives only ~3,350fps with the 150gr bullets, but accuracy is sub-moa if bullet is up to it.....

I've had good results from the few 200gr Nosler Part. factory loads I've shot through the gun. (20rds obtained with the rifle. Accuracy was excellent-matching the best I've obtained with the 180's, or even better...)
However, This rifle being so much heaver (a Savage M110 w/Simmons 3-10X "44mag" scope @ 9lbs) vs. my Remington M7 in 7mm08 @ 7.2lbs w/ Leupold 2.5-8X Vari-X III, it doesn't see much use except at the Range.

My next project over the next year with this "Monster" will be to develope some reduced loads with the 180's at '06 velocities. Accurate and Hodgdon/IMR have some interesting data for XMP-5744 and SR-4759......

p.s.
With the surplus powder and bullets I obtained in bulk before the huge price increases, I'm shooting this monster for less than I can reload for a .308 or my 7mm-08. Bullets ran me about 9cents each, Powder is about 15cents as shot, and primers about 2.5cents.. neglecting the cost of the brass this is 28cents as shot.......Not bad for one of the hottest cartridges on the scene these days....

xringer3
February 25, 2008, 01:01 PM
Again, thanks guys for all the great info you've provided. The more info I get from you and reading up on, I might not be in too much need for another rifle for anything else with the versatility this one cartridge seems to have. I'm eager to find an 06 load for local hunting and then the supercharged stuff for when I go out west. This cartridge seems to span such a broad range that I'm gonna be very busy with trying loads from different extremes! Don't know were I'm gonna find the time to also find a hunting load and light fun load for the 1895CB I also picked up at the same gun show, LOL.

You guys have been great..............Thanks again.......Vince

Harley Quinn
February 25, 2008, 01:37 PM
Both of these guns you bought can be real painful to the shoulder bone if loaded to the max:cuss::what:

Sounds like you are loaded for bear:D

HQ

xringer3
February 25, 2008, 02:37 PM
You're right Harley. I plan on putting a muzzle break on the mag and mainly use the marlin with medium cast loads for fun. It won't get loaded to max unless I'm in bear country.

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