It seems I have 3 .300 rums for some reason. A super grade Winchester a Montana stainless synthetic then another Winchester classic that might be begging for a rebarrel. .338,.375, or??

those choices mentioned would require changing the boltface... most common change is a .404 jeffery,, simple rebarrel...

338 rum or 375 rum same case. I meant keeping the same bolt. Yeah 404 a possibility but I have many big bores and maybe what a fast 338 or 375

375/404 improved!

I've had three 338 RUMs and have a 375 RUM currently.

I prefer the 375 for the kind of hunting I do.

quote:

Originally posted by gunslinger55:
338 rum or 375 rum same case. I meant keeping the same bolt. Yeah 404 a possibility but I have many big bores and maybe what a fast 338 or 375

It would be a tough choice for me between the 338 & 375 RUM. I have neither, but like both.
My choice would be the 375 RUM.

I had my RUM chambered rifle rebored to .425 Westley Richards. The bolt face is wrong, but I make the cases out of RUM brass and I have a spare bolt in case I ever find myself with factory .425 ammunition
(not likely).

rums are rebated rims, gents .. .532-.534

any 3.65" round should be nice .. might need feeding rework..

Yes, RUMs are just standard belted mag bolt size, so no drama there.
Go to 338 RUM.

I'd vote the 338-300RUM. It's an easy wildcat to make, and I'm guessing you already have a supply of 300RUM brass. This basically has the best long range ballistics you can get out of a "standard" rifle. It's fun to play with, but expensive to feed, so I have a few other barrels that share the same receiver.

I have the same problem and am 99% decided on the .404 Jeffery.

I have never found the .338 Win. Mag or .375 H&H Mag. to be lacking.

So, I can see no need for RUM/Jeffery based versions of those fine rounds.

I have even settled on a .300 H&H Mag. as my .300 Mag. of choice. Plenty of power for anything I would want to shoot with a .300 bore.

In the same vein, the .404 Jeffery offers plenty of power and, beyond that, is also a classic. (As you may have figured out, I’m a sucker for classics.)

It would also get me one third of the way toward my classic dream battery of a .303, a .404 and a .505!

Make into a .460 G&A

As jimacat said, the Model 70 CRF rifles in 300 RUM were sought after for conversion to 404 Jeffery rifles.

Good advice all. Except now I have more options to consider.

Votes for 338 rum
375 rum
404j
460 GA
425 WR

375 sounds pretty useful. I’ll look at them all

I got a good assortment of big bores so I’d like to find something that compliments them in some way. Not sure exactly what that may be but I’ll find something

Elaborate please. Sounds like you know a bit about these calibers

quote:

Originally posted by Ongwe:
I've had three 338 RUMs and have a 375 RUM currently.

I prefer the 375 for the kind of hunting I do.

375 seems to be getting more votes

quote:

Originally posted by ldmay375:

quote:

Originally posted by gunslinger55:
338 rum or 375 rum same case. I meant keeping the same bolt. Yeah 404 a possibility but I have many big bores and maybe what a fast 338 or 375

It would be a tough choice for me between the 338 & 375 RUM. I have neither, but like both.
My choice would be the 375 RUM.

338 must be an impressive setup as well

Ross,

A 225 ACB at 3150 fps is a hammer in the 338 Ultra. I love the 338 caliber. I've had great results with 338 WM, 340 WBY, 330 Dakota, 338 Ultra and 338-06. To my mind the Ultra is the best of the lot.

Mark

I share the appreciation for 338 cartridges. The common 338 Winchester seems work well on most anything in North America.
The 338 RUM does bump up the velocity a couple of notches. And added case capacity has advantages when using the higher bc bullets.

I am just more intrigued by the 375 RUM. A 270 grain LRX at close to 3000 fps would not be too shabby in flight and upon impact.

I can easily get 3000 fps with 270 gr TSX bullets from by .375 RUM and have used that combination in South Africa for a variety of animals from a Steenbok to a Cape Eland.

Occasionaly I'll find 7mm RUM or .300 RUM cases at the range and they easily neck up to .375 RUM.

Maybe think about a 35 caliber on the RUM case, I had one built and love it. Or try a 416 on the RUM case.

404J
375 H&H

quote:

Originally posted by buffybr:
I can easily get 3000 fps with 270 gr TSX bullets from by .375 RUM and have used that combination in South Africa for a variety of animals from a Steenbok to a Cape Eland.

404 is the obvious answer.

375 RUM is one of my favorites and has a lot of versatility...270gr at 3k, 300 at 2800, 350 at 2550 can do a lot with recoil as the only downside. They never made any Left Hand M70 CRF's in the Ultra's so mine is a converted 300 Win.

In the process of building a 416/375 RUM for an upcoming brown bear hunt on another converted M70 lefty...mainly to run 350 TTSX at 2800 and because finding a 416 anything left hand is crazy expensive.

.375 sounding pretty useful. I have a .416 RM but sounds like a .416 rum could be as well

Keep in mind the .338RUM and .375RUM are different length cases.
338's are shorter.

IF any of you have a spare 50 7mm or 300RUM cases
I would like to pick up that many more.
I built a .358RUM. Split too many cases before I annealed the rest. I can't use the .338RM's too short.

Thank you,

George

Keep in mind the .338RUM and .375RUM are different length cases.
338's are shorter.

IF any of you have a spare 50 7mm or 300RUM cases
I would like to pick up that many more.
I built a .358RUM. Split too many cases before I annealed the rest. I can't use the .338RUM's too short.

Thank you,

George

Ok so the .375 rum is the same length as the .300?

quote:

Originally posted by gunslinger55:
Ok so the .375 rum is the same length as the .300?

Yes...that is correct.

I think one is usually best advised to sell his existing rifle and buy another in whatever he wants like a 338 Win or a 300 H&H or whatever blows his skirt up! or neck up your RUM to a 338 cal. if you must

gunslinger:

All the RUMS have he same length case except the oddball .338 Rum is shorter.

George

If you really want to play with it, go .358 caliber as you can load bullets from 90 to 300 grains.

Interesting

Bottom line is I cannot imagine life without at least one 404 Jefferys...but apparently you are of the velocity clan and would probably be more content with a wildcat .338 of sorts. And of course, there is no problema with that.

quote:

Originally posted by jpl:
I'd vote the 338-300RUM. It's an easy wildcat to make, and I'm guessing you already have a supply of 300RUM brass. This basically has the best long range ballistics you can get out of a "standard" rifle. It's fun to play with, but expensive to feed, so I have a few other barrels that share the same receiver.

Yep .338 Edge! Hell of a cartridge, easy to tune and simple to form.

.

I have a gun safe full of big bores. While the .404 is iconic it is not needed. But you never know…..

quote:

Originally posted by Atkinson:
Bottom line is I cannot imagine life without at least one 404 Jefferys...but apparently you are of the velocity clan and would probably be more content with a wildcat .338 of sorts. And of course, there is no problema with that.