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Never see much on here about the 375 Ultra. Opinions? I just got an XCR 700 a short while ago and started loading for it. Weather has kept me off the range for the most part but the one time I've had it out I was surprised at how easy it was to control the recoil considering how light the rifle is. I was shooting from the bench; I did make an effort to shoot with my head more upright rather than leaning down into the scope. Granted they were middle of the road loads with 260 and 270 gr bullets. Thought I'd work my way up to braving the top end 300 gr loads. As a sidenote; Nosler found the cartridge to be accurate as they have made it their standard test cartridge for .375 cal. as per 5th edition manual. I'm thinkin a 260 gr accubond .473 BC crowding or over 3000 fps is a pretty mean combo. Then again a 300 AB at 2850 might be more better!

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Yes, there certainly seems a lack of interest, at least on froums. On Australia's biggest forum all the other 375s are there, that is, H&H, 375 Wby, 375 Ruger and 378. Maybe only being in Rem 700 rifle is a reason but then there are a lot of Rem 700s in 375 H&H.

I think it would be a great 375. Using Varget it would duplicate top H&H loads with low pressure as does the 378. It kind of relates to the the 375 H&H about the same way as the 416 Rigb relates to the 416 Remington.

I really like the RUM case as it maximises out what can go in standard actions like the Rem 700 and M70. A mate of mine has done a lot with the RUMs and especially the 338 and has also taken the 338 to Africa.

But again, to get the full enjoyment the 375 RUM should give I think you will like playing with 375 H&H duplication loads. In a 378 85 grains of Varget is about 2650 with 270 grainers and extremely low pressure and the same load hits 2500 plus with 300 grainers and a bit over 2700 with the 225 grain Hornady. Loads for the RUM will obviously be a bit less powder

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I shot a deer with mine year before last. Used 225 Hornady with AA5744. Its was about 2700 fps and shot 1 inch 5 shot groups. Oh the deer was a bang flop at about 200 yards. I find the recoil to be very easy to control.

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IMO not many people work with the round cause it's a bit more than most wish to deal with when it comes to recoil. Personally I feel that it's a heck of a good round and the ones I've been around have been very good shooters.

I use a 375 Wby quite a bit and could easily hunt the world and several life times with a good 375 (of some sort) a 270 and a 223.

Dober


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Have a friend who had a CRF one made up by re-barreling a Win Classic SS M-70 from 300 RUM to 375 RUM. He shot a brown bear with it several years ago with 300 grain bullets - don't remember which. Said he was very satisfied with the accuracy and finality of performance on the bear.


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While I don't see a dangerous game hunt in my very near future; its still nice to know I have something in the arsenal to kill something big with. For the time being I'm going to play with the accubonds and enjoy the 270 Win/150 gr like trajectory out of a 375. I'll just throw it into the rotation and go hunt elk with it. I've only shot two groups with it. I haven't even begun to tune a load and it shot 1.5" and 1.25" w/260 AB and IMR 4350. I now have several loads loaded to try. Can't wait to make it out to shoot!

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Personally, I think you'll come to enjoy it. Keep us in the loop how its going with it.

Dober


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That kind of accuracy - and better with fairly straightforward load development - is been my experience with both the 300RUM and 338RUM cartridges. They seem to be well designed. Good hunting!


Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it Almighty God! I know not what course others may take, but as for me, give me liberty of give me death! P. Henry

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Each and every one of the RUM's I've ever been around have exibited similar qualities. All have been spirited when it comes to recoil and they've all been incredibly good shooters!

Dober


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The Remmy 700 I had once was an excellent shooter...recoil was easy if you will. I reload so getting what I want to shoot and where was easy with this rifle.....of course all I could do to the rifle was done...bedding, trigger, changed out the Jlok on it to a Hollands...may just reconsider and do a .375 RUM instead of a .404 Jeffe

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A no-lose but tough choice, as the 404 Jeff is not only effective but a tradionalist's sentimental favorite!


Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it Almighty God! I know not what course others may take, but as for me, give me liberty of give me death! P. Henry

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I have one and have tinkered with it some. I think you will find quite a bit of variance on the published FPS, and load data.

I had mine over a Chrono in NM at about 4000 ft and 90 degrees. I was probably shooting 260ABs or the 270 Horn. I think I was topping out at 2950ish. I think factory specs may list a god deal more than that.

2850 is a good bit more comfortable.

And like you, I have often wondered why there is little to no interest in the round, but as stated, I think once people open a box of ammo, the round seems Too Much of a Good Thing.

I may look into breaking mine in the future, as I would like to keep my retinas attached to my eyeballs.

That specs on the 260 Accubond and a decent FPS sure look appealing though.


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Originally Posted by Mike378
But again, to get the full enjoyment the 375 RUM should give I think you will like playing with 375 H&H duplication loads. In a 378 85 grains of Varget is about 2650 with 270 grainers and extremely low pressure and the same load hits 2500 plus with 300 grainers and a bit over 2700 with the 225 grain Hornady. Loads for the RUM will obviously be a bit less powder


Where did you find these Varget loads for the 378?

Thanks


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Originally Posted by mtnfisher
Originally Posted by Mike378
But again, to get the full enjoyment the 375 RUM should give I think you will like playing with 375 H&H duplication loads. In a 378 85 grains of Varget is about 2650 with 270 grainers and extremely low pressure and the same load hits 2500 plus with 300 grainers and a bit over 2700 with the 225 grain Hornady. Loads for the RUM will obviously be a bit less powder


Where did you find these Varget loads for the 378?

Thanks


I Know Mike personally. He does not "find" loads, he "develops" them. Mike is the most knowledgeable handloader I ever met in my 48 years of shooting. If he says it is so, you just got the shortcut of your life.

His knowledge about handoading, bedding or most things rifle, far exceed anything ever published.

JW


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Originally Posted by AussieGunWriter
Originally Posted by mtnfisher
Originally Posted by Mike378
But again, to get the full enjoyment the 375 RUM should give I think you will like playing with 375 H&H duplication loads. In a 378 85 grains of Varget is about 2650 with 270 grainers and extremely low pressure and the same load hits 2500 plus with 300 grainers and a bit over 2700 with the 225 grain Hornady. Loads for the RUM will obviously be a bit less powder


Where did you find these Varget loads for the 378?

Thanks


I Know Mike personally. He does not "find" loads, he "develops" them. Mike is the most knowledgeable handloader I ever met in my 48 years of shooting. If he says it is so, you just got the shortcut of your life.

His knowledge about handoading, bedding or most things rifle, far exceed anything ever published.

JW


Thanks JW. I'm always looking for "new" loading data on the 378.

I did send him some pictures of the 378 magazine box a few weeks ago. smile


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I have wanted a 375 RUM set up like a baby big 50. Use a bull barrel about 28-30 inches long. Single shot. Long range turret style scope. Shoot 300 Sierra BT's. When that bullet arrives you have something!

Last edited by RinB; 12/27/09.


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Yes I'll Have one!

I think its a great calibre. Nosler in their manual claim its the most accurate 375.

I'd have to agree on the accuracy claims as you can see below:
[Linked Image]

Mine is a std M70 stainless 375H&H reamed to RUM and dropped into a wood stock from a M70 Safari. (Heck you can't have a DGR without CRF right??? eek)

Really comes into its own with the long monolithic bullets where the H&H gets a bit challenged for powder space.

regards
JohnT

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I really need to try one of these. Seems like a neat cartridge.

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After shooting several hundred round of .300 RUM, I know that I am not up to the .375 RUM. I just lack the intestinal fortitude to shoot one off a bench.


Thus saith thr lord; Cursed be the man that trusteth in man, and maketh flesh his arm, and whose heart departeh from the lord. Jeremiah 17:5 KJV
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400 gr, .411 at 2400 will do the job and hurts nowhere near like the RUMS. (I owned a 700 BDL 300 RUM for 8 rounds, still painful to recall that snapping SOB)

[Linked Image]


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