Which cartridge for a Remy 700 long mag bolt face

[RH300UM]

Well I've got the bug again. Setting around recouping from surgery gives me WAY to much time to let my mind wonder and think about things I shouldn't.
It could be worse I guess but it's my brain and it doesn't really seem to work any other way!
I have a Remington 700 long action magnum that is presently a 300 rum. It was my first long range rig. Killed a bull elk at 847 yards as my first confirmed long range kill and many more since then.
It's time to give it a make over/upgrade. I was thinking about going the nostalgia route and keeping it a 300 rum as I have 500 brass and dies. The action has a Wyatts MBE-3 mag box extension but remains OEM otherwise.
It would be the only.30 cal I have as I have gotten rid of or given the other away. Except my 30/30 saddle rifle
Over the years 7's and 338's have proven more effective
It would most likely be a safe queen that will be left to a child or grandchild after I'm gone.
Never the less I'm going to give it what it deserves and build a new rifle
What's your thoughts?

 

[BAKPAKR]

With all that brass and a hankering for a 338, how about a 338 Edge? With the MBE-3, you will need to load a little shorter than you would with a CFE-9 but I bet you could get by.

 

[RH300UM]

Got my 338 filled with the 338 RBH (338 Norma mag improved)

 

[Phil Rizzo]

7 Sherman Mega

 

[jessej]

Keep it a rum. Of some sorts.

 

[dustbag]

300 Rum 9 twist 245 Bergers.
At least that's on my list at some point.

Just shot mine today. 10 twist. 220 eldx do well. Working on some 220 LRHTs. Might have an opportunity to attempt a mile this fall.

 

[RH300UM]

7 Sherman Mega

Been down the Sherman road before
Found the off ramp and won't turn around again!

 

[Laguna Freak]

Well I've got the bug again. Setting around recouping from surgery gives me WAY to much time to let my mind wonder and think about things I shouldn't.
It could be worse I guess but it's my brain and it doesn't really seem to work any other way!
I have a Remington 700 long action magnum that is presently a 300 rum. It was my first long range rig. Killed a bull elk at 847 yards as my first confirmed long range kill and many more since then.
It's time to give it a make over/upgrade. I was thinking about going the nostalgia route and keeping it a 300 rum as I have 500 brass and dies. The action has a Wyatts MBE-3 mag box extension but remains OEM otherwise.
It would be the only.30 cal I have as I have gotten rid of or given the other away. Except my 30/30 saddle rifle
Over the years 7's and 338's have proven more effective
It would most likely be a safe queen that will be left to a child or grandchild after I'm gone.
Never the less I'm going to give it what it deserves and build a new rifle
What's your thoughts?

That RUM boltface doesn't seem like it would be good for what I would build on a Rem long action, 264 WM throated for 150+ gr. But you could build a long action 300 WSM for 210 gr +, or 270 WSM, and of course there is nothing wrong with keeping it 300 RUM. You might go 22" to 24" barrel and put a can on (or an effective brake) to encourage more use by whoever is the fortunate heir(s) that receives it in the future.

 

[std7mag]

For a rifle you might be planning on passing down, I wouldn't do a 338 magnum anything.

7mm Rem Mag
7mm LRM
28 Nosler
In that order.

 

[BAKPAKR]

One of my 300 RUMs became a long-throated 30 Nosler.

 

[Idaho Lefty]

Better YET,...

For a rifle you might be planning on passing down, I wouldn't do a 338 magnum anything.

7mm Rem Mag
7mm LRM
28 Nosler
In that order.

7 PRC for,.. the Win !
Slap, a 24 inch, Proof Barrel, on that Action, in 7 mm PRC for,.. 1/2 MOA Accuracy with, 180 gr ELD-M's !
Add a PVA, Back Country, Jet Blast, 3 Port Brake and,.. ENJOY ! ( LOW "Blast" @ Shooter, + low Recoil )

 

[Phil Rizzo]

7 PRC for ho-hum performance, 30 degree shoulders, and excessive length for capacity… I'm on my 2nd barrel.
First was 24, this one 26".
It's ok, just a little boring.
That's why I'm breaking in a Mega now.

Seems to Me very few understand the biggest benefit of most of Rich Sherman's work.
It's the case design that translates into long life with efficiency and plenty velocity. Sometimes that means a shorter action can be utilized.

It's not about outrunning the closest cartridge to compare to, for Me.
He's just the only one I've known to have pretty much standardized his own lines, with 40* shoulders, and with brass and dies. In my eyes they are without equal, thanks to his changes, making the absolute most of a given length. And maintaining adequate neck length+. The big guys have known how to do this for a long time but they can't utilize the traits, in a broad spectrum.
Less body taper
40deg shoulder
Longer neck

The SM's are another discussion, performance only. And plenty of it, from what I can see.

If there's a better concept alive and well, and supported, please fill me in.

 

[Idaho Lefty]

The OP's Heirs, would Probably LIKE to, Go to Scheel's and Buy, a Box or, Two of,.. Ammo !
And Go,.. Shoot, the Durn, thing !
Maybe, I'm just too,. Practical ???

 

[RH300UM]

I'll add this
Got a 7 SAUM 175's-180s@ 3000fps
Got a 7 RBH 195's @ 3250fps
Got a 338 RBH 275's @ 2950fps
Got a 243 AI 108's at 3250 fps
Got a 375 RBH 300's @ 2800 fps
All my other rifles went by the way of funding my hunts and guide needs