300 Ultra Mag
 

I know a descent amount about the 300 Win Mag and 300 WSM, but not much about the 300 Ultra Mag. Can somebody please tell me a little about it? How flat does it shoot, compared to the Win Mag and WSM? Thanks
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RE: 300 Ultra Mag
 

The 300 ultra has a lot more case capacity and does produce more velocity than the 300wsm or the 300winmag.It also has more recoil than either of the other two.The factories also load the ultra mag very mild so it can only reach it's potential with handloads.I use the 300ultra mag myself and find it to be the best moose and elk cartridge that I have used.

RE: 300 Ultra Mag
 

You will gain about 300-400 fps over the Win Mag or the Weatherby number. If I already had one of the more common ones, I personallly would not buy one. Shells are expensive and you will find them only at full service gun stores so far. If you need the extra range and recoil then it would be a good buy as thier price at least in a Remington rifle is pretty reasonable. As far as hunting goes a Moose or Bear would not notice the defference in any of the 300 Mags.

RE: 300 Ultra Mag
 

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You will gain about 300-400 fps over the Win Mag or the Weatherby number. If I already had one of the more common ones, I personallly would not buy one. Shells are expensive and you will find them only at full service gun stores so far. If you need the extra range and recoil then it would be a good buy as thier price at least in a Remington rifle is pretty reasonable. As far as hunting goes a Moose or Bear would not notice the defference in any of the 300 Mags.


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There is actually a 300-400fps difference between the .300 Win Mag and the .300 Wby Mag. So, apparently, the .300 Ultra Mag must beat the Winny by 600-800fps. Don't believe the factory-published ballistics for the .300 Win Mag, or any other standard caliber, for that matter. The one thing I can say for Weatherby ammunition, expensive though it is, that stuff is loaded!

Good Dogwork and Good Hunting

RE: 300 Ultra Mag
 

Got a buddy that has an ultra mag, it is flatter, but it aint 600 FPS flatter! That would mean it is pushing a 180 gr. bullet at 3750fps or so, and that aint happening! And yes, we shoot long range, VERY long range!

RE: 300 Ultra Mag
 

a know a guy who has a custom gun done and he has a 300 rum imp that shoots 240gr match kings at 3200fps (that's with a 34 inch barrel and seating the bullets out further). he shot some 180gr bullets once just for fun (the bc is to low to shoot far with them. they drop to fast &quot;way&quot; out there) and he was around 3600-3700fps with them. it all depends what kind of gun your shooting.

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RE: 300 Ultra Mag
 

I got a 300RUM, and 300Win, and wanting a 300WSM and had the 300Weatherby. Yea, it cooks. If you want a round that can push a 180 bullet 3350fps, then the RUM is for you. Reason I got it was I wanted something to push heavier bullets &gt;3000fps without a belt. But if the recoil is too much, and you want a cartridge without a belt, then the WSM is for you. People are really doing well with these rifles. I didn't like the weatherby and had accuracy problems. If can be very finicky with different bullet seatings due to the extreme freebore. And ammo is outrageous. The 300RUM ammo is getting very easy to find as 300Win, and not near as expensive as Weatherby rounds.

RE: 300 Ultra Mag
 

I really enjoy my 300 rum. Mine shoots 3/4&quot; groups with factory 180gn ammo. The 150gns are not very accurate though. I just started reloading it but I haven't had the chance to shoot any reloads yet. Anyone out there have any 300 rum recipes?

RE: 300 Ultra Mag
 

Evening. I'm handloading the .300 RUM with 95 grains of H-1000 using a 180 grain Nosler Partition. I get minute to sub minute of angle accuracy at 100 yards. My rifle is a Rem 700 BDL with 26 inch barrel and muzzle break. Regards.

RE: 300 Ultra Mag
 

Bigcountry, how did that Krieger barrel work out for you with your .300 ultramag? You might have commented on it earlier but I missed it.

RE: 300 Ultra Mag
 

Like a champ. I forgot how a barrel should be built. I am so used to shooting rough barrels. It was expensive, but I would do it again. Gunsmith disappointed me a little. He got my throat a little longer than I planned. I still can't reach the lands and still have one caliber (.308&quot;) inside the brass. I shouldn't have bargained shopped for people rebarreling my gun. It was just Krieger seemed to have raised their price to $295.

RE: 300 Ultra Mag
 

bigcountry, I understand what you mean by not being able to reach the lands, but could you explain what you mean by &quot;still have one caliber inside the brass.&quot; I'm a newbie reloader.

RE: 300 Ultra Mag
 

Basically, they say. But they say alot if you know what I mean. That if you are reloading a say a 270Win. You want at least one caliber of bullet into the brass for sufficent neck tension or you might get blow by or whatever. By one caliber, that means at least .277&quot; of bullet inside the brass. For a 300RUM, .308&quot; of bullet seated in the brass. You really don't want that bullet so fragile you might knock the bullet cockeyed chambering.

RE: 300 Ultra Mag
 

Thanks!

RE: 300 Ultra Mag
 

Bigcountry, The gunsmith most likely used a standard chamber reamer. On my next custom I'm going to have my own reamers ground to shorten the throat and also have the neck diameter made a few thousants smaller. I turn the necks on my Rem brass because a majority of it has runout measuring between the outside and the inside. What are your groups looking like now?

RE: 300 Ultra Mag
 

About 0.3&quot; at 100 yards with Sierra 200 Matchkings so I shouldn't complain. But its a little finicky in seating depth. Which tell me it will finicky with temp changes also. So I blamed it on the throat. Haven't worked on hunting loads yet. Got some 180 Nosler Partitions loaded with Retumbo and 180gr Speer's ready to go for this weekend. But really don't plan on taking this thing hunting again. I think only lightweight these days. This is just my real real long range gun.

So you do your own reaming?

RE: 300 Ultra Mag
 

I plan on building my next custom doing all the machine work myself. I've built a few custom revolvers in the past working with a friend of mine who is a gunsmith. Ready to step up to the big league and build a rifle. I know what you mean about weight, I lugged that 13lb .338 cannon all over the mountain in Colorado. A good sling realy helps! Next gun may well be a .300 WSM, Rem action with flutted bolt, light 24&quot; fluted barrel. Nice light carry gun that still has good energy out to 500 yards. I've got some nice groups out of my .300 ultra using 180g Partition golds and RL22. Taking my son to CO this year, he'll be using it for his gun. One in our group shoots .300 ultra factory Partitions in stock barrel, 3/4 MOA out to 300 yards. He took a nice bull, cow and mulley this past season, plus killed a cow for another hunter that ran out of bullets!

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RE: 300 Ultra Mag
 

DG, he's giving me the run around. I am finished dealing with him. Talking to Kreiger to have them ream the barrel they said without a doubt I should be able to reach the rifling with most bullets and stay under 3.6&quot; OAL. So I bargained shopped and my smith said, he was renting a reamer and he was getting a special one the low freebore. For a hundred cheaper than Krieger. So three months pass and I get my gun, and now he's trying to say, &quot;there's no way I could get a reamer to give you what you want cause no one will make one&quot;. I know its accurate, but its not the way I wanted it. So his answer is now that he has a reamer he had made for him for a 300Win mag. But again, this is not what I wanted. I just don't like being lied to. And he just didn't want to go thru his time getting a reamer instead of renting.