.300 win. mag. vs. .300 RUM

[atticrat]

I'm a bit unfamiliar with the .300 Remington Ultra Magnum. I have a Remington 700 in .300 Win. Mag. Considering getting a .300 RUM for x-mas.

Are these two rounds ballisticaly similar? I know the ultra mag has higher velocity, but how much difference is there in knock-down power using the same bullet? eg. Hornady 180gr. A-Max

Would there be a noticeable performance difference? Should I just get another .300 win. mag.? The new rifle will be a Remington 700. Has anybody shot both, any pros and cons?

Any advice would be appreciated.

 

[98G]

I've shot both. The RUM is a good deal hotter, but your taget, be it game animal or paper, won't be able to tell the difference.

I got 3150 fps out of my handloads(180gr ballistic tips) in a TRG-41 with a 27" barrel(winmag). I get 3380 fps with the same projectile in a 26" sendero(RUM). Both are published loads.

98G

 

[Frohickey]

300WinMag is a belted case
300RUM is not a belted case, and headspaces at the shoulder, so theoretically, it should give more accuracy.

I think the 300RUM gives a wider powder as well, though, its longer for more powder capacity as well, so that might be a wash.

Think of the 300RUM as the 300WinMag Mag

 

[atticrat]

.300 winmag vs. .300 RUM

The thought of considering the Ultra Mag as a .300 winmag mag. was helpful. After looking through several catalogs, I can only seem to find 1 manufacturer for factory loaded .300 RUM. Anybody have any ideas of sources for factory loads for the Ultra Mag.?

 

[Frohickey]

Remington would have them, of course.

I think components can be had as well, and I remember seeing links for load data, if you reload.

 

[WonderNine]

300WinMag is a belted case
300RUM is not a belted case, and headspaces at the shoulder, so theoretically, it should give more accuracy.

I'm wondering then, why does the U.S. Army's sharpshooters use .300WinMag? You always hear about snipers using .300WinMag too....

 

[uglygun]

It's just as easy to get the 300WinMag cartridge to headspace on the shoulder, handloading practice for doing so with a 300WinMag really isn't any different than how it is done for the 300RUM when accuracy is the main consideration.

Belted cartridges went out of fashion quite some time ago for controlling headspace. The accuracy buffs out there will generally only be neck sizing their cartridges and not disrupting the shoulder by full length sizing. Especially when they are well aware of their chamber specifications and they know just exactly how to get the optimum case/chamber fit, for the 300WinMag that pretty much means considering the neck/shoulder and not the belt.



300RUM balistics should give it the ability to throw a bullet out to a further supersonic flight distance but accuracy wise the 300WinMag and 300RUM are probably pretty close. Maybe the 300RUM has the "PPC fat and short" thing going to it where it's proportions are similar to that of the favored PPC line of benchrest cartridges. Not sure if I believe it though.


I'm almost sick enough in the head to consider getting my 300WinMag rechambered to 300RUM when I have it rebuilt but I'm not sure if my shoulder will like me for it. Prone shooting with the 300WinMag gets bad enough after 30-40 rounds.

 

[kudu]

Got the .300wm, shot the .300rum. I generally don't mind recoil but unless the rum is in a 9lb gun I don't want one. I'll stick with the win mag cartridge because I know what it will do out to 900yrds through my gun. You will only get a little flatter tragectory with the rum, but you have to burn more powder to do it.

 

[Frohickey]

When I was mulling over the idea of getting a 300RUM, I also started looking at gunsmiths that would put a muzzlebreak on the rifle.

Some were advertising 300WinMag muzzlebreaks that bring down felt-recoil to the level of a 243Win.

Score High Muzzle Break

I'm sure there are more places that make muzzle breaks. Do your research.

 

[tex_n_cal]

I can pretty easily reach 3150 fps with 180's out of my Ruger #1 .300 winmag, with published loads. That's enough

 

[Frohickey]

..but..but...

what if a profit-hungry corporation decides to culture some DNA that they found locked away inside of insects trapped in some amber, and they clones a slew of prehistoric dinosaurs, but they had to recombine the DNA with that of some frogs, and they are in danger of getting loose from the park because an employee disabled the security system so that he could steal a few embryos for the company's competition.

 

[KMKeller]

If you buy a 300 RUM, let me know. I've got a box and a half of Federal Premium Trophy Bonded Bearclaw I'll send you for the cost of shipping.