SAUM based wildcats

[DA7]

Does anyone know of Remington SAUM based chamberings (other than the 7mm or 300) or similar cartridges that have the same size of cartridge base?
I'm dreaming of ones chambered in 260cal and 338cal. I'm toying with the idea of one day turning my Model 7SS into a switch barrel hunting package. I like the gun that much

 

[b72471]

SAM (SAuM) calibers

I have the 7 & 300 SAuM. Wouldn't trade them, you can wildcat this brass to whatever you want, much like Winchester did with their WSMs. These short mags come very close to the original long mags, but you will have better barrel life with the short mags. One caliber for all would would be the 300 SAuM.
Bill

 

[Ardent]

Might as well use the WSM case (identical for all intents and purposes to the SAUMs), and it's all already been done thousands of times by now so you can probably even order dies direct from Redding or Hornady etc. The .325 WSM is very close to what you're proposing in the .338 SAUM and already exists with factory ammo and rifles. 6.5 WSM is a common long range chambering, though it's grossly overbore and hard as hell on throats. 6.5-284 is vastly more sensible for a long range barrel burner, and proven among the most accurate cartridges on the planet already. It will not only beat a 6.5 SAUM or 6.5 WSM in competition, factory Lapua brass is available, dies are available, and the barrel will last longer. The world's best 1000 yard shooters haven't outgrown the 6.5-284 or straight 284, so I doubt we will!

 

[blargon]

Does anyone know of Remington SAUM based chamberings (other than the 7mm or 300) or similar cartridges that have the same size of cartridge base?
I'm dreaming of ones chambered in 260cal and 338cal. I'm toying with the idea of one day turning my Model 7SS into a switch barrel hunting package. I like the gun that much

6.5 Rem Mag or 6.5 SAUM would be my choice. If you want a heavier caliber, look at the .350 Rem Mag also.

6.5-284 is vastly more sensible for a long range barrel burner, and proven among the most accurate cartridges on the planet already.

6.5-284 Norma won't work in the short action M7. COL is 3.3" according to Nosler's reload data. Also, he has a magnum bolt face.

http://www.nosler.com/Reloading-Data/6.5mm-284-Norma-130-Grains.aspx

 

[archie_james_c]

Might as well use the WSM case (identical for all intents and purposes to the SAUMs),

The WSM is not, for all intents in purposes, identical to the RSAUM case.

 

[bearkilr]

Aren't the SAUM's considered obsolete? They should be...........

 

[Northman999]

These short mags come very close to the original long mags, but you will have better barrel life with the short mags. Bill

You really sure about this?

Last time I checked the 300 SAUM was about an honest 300 fps behind a real 300 Ultramag with 180gr bullets, and really, maybe a tad more than 100 fps faster than a handloaded 30-06...

 

[Ardent]

The WSM is not, for all intents in purposes, identical to the RSAUM case.

That's a good one! This is as close as two competing cartridges get in the marketplace, they are, for all intents and purposes, identical.

.300 WSM

Neck diameter .344 in (8.7 mm)
Shoulder diameter .538 in (13.7 mm)
Base diameter .555 in (14.1 mm)
Rim diameter .535 in (13.6 mm)
Case length 2.100 in (53.3 mm)
Overall length 2.860 in (72.6 mm)

.300 SAUM

Neck diameter .344 in (8.7 mm)
Shoulder diameter .534 in (13.6 mm)
Base diameter .550 in (14.0 mm)
Rim diameter .534 in (13.6 mm)
Case length 2.015 in (51.2 mm)
Overall length 2.825 in (71.8 mm)

 

[archie_james_c]

.300 WSM


Case length 2.100 in (53.3 mm)
Overall length 2.860 in (72.6 mm)

.300 SAUM

Case length 2.015 in (51.2 mm)
Overall length 2.825 in (71.8 mm)

Those 2 dimensions are the important factors. SAUMs have a much longer neck and allow you to seat your bullets out farther from the case while maintaining the same COAL as the WSM.

 

[archie_james_c]

You really sure about this?

Last time I checked the 300 SAUM was about an honest 300 fps behind a real 300 Ultramag with 180gr bullets, and really, maybe a tad more than 100 fps faster than a handloaded 30-06...

The SAUM's are not made to mimic the full size RUM. They should have never been marketed that way. They are made to mimic the long mags like 7RM, and 300 Win Mag.

 

[Mur]

You really sure about this?

Last time I checked the 300 SAUM was about an honest 300 fps behind a real 300 Ultramag with 180gr bullets, and really, maybe a tad more than 100 fps faster than a handloaded 30-06...

The .300SAUM was designed to offer a S/A altrnative to the .300 Win Mag,and it is very close except with the larger bullets.Neither can compete with the .300RUM,powder capacity always decrees velocity. Mur

 

[archie_james_c]

The two short-n-fats on the left in this pic, left-most a 7SAUM, right-most a 7wizzum.

The shamu gives up maybe 50fps on a good day to a wizzum when loaded to identical COALs, load the SAUM out and you now have more powder room or reduced pressure.

SAUM-1 WSM-0

 

[Ardent]

Those 2 dimensions are the important factors. SAUMs have a much longer neck and allow you to seat your bullets out farther from the case while maintaining the same COAL as the WSM.

No, the neck is only longer for the SAUM in the 7mm versions as Winchester moved the shoulder of the 7mm WSM forward to preclude it being chambered in the .270 WSM accidentally. Look at the .300 SAUM and .300 WSM- identical. He's talking about wildcatting too, no difference between the two as the basis for a wildcat, and if anything, the WSM gives him a smidge more brass to work with- but we're talking 0.085" more brass- meaningless.

 

[archie_james_c]

No, the neck is only longer for the SAUM in the 7mm versions as Winchester moved the shoulder of the 7mm WSM forward to preclude it being chambered in the .270 WSM accidentally. Look at the .300 SAUM and .300 WSM- identical. He's talking about wildcatting too, no difference between the two as the basis for a wildcat, and if anything, the WSM gives him a smidge more brass to work with- but we're talking 0.085" more brass- meaningless.

Sorry, I should have specified I was referring to the 7's.

The 270/300WSM should is bumped back 36 thou compared to the 7WSM. The 300 SAUM shoulder is still shorter than the 300wizzum, but as you said its splittin hairs.

 

[bearkilr]

The two short-n-fats on the left in this pic, left-most a 7SAUM, right-most a 7wizzum.

The shamu gives up maybe 50fps on a good day to a wizzum when loaded to identical COALs, load the SAUM out and you now have more powder room or reduced pressure.

SAUM-1 WSM-0

Wizzum? Shamu? There are less letters to type in the proper name. Do everyone a favor and use the correct term..............damn kids.

Aren't you the one selling the 7mm SAUM on the EE and say in your ad you'd basically give your left nut for a 7mm WSM?

 

[archie_james_c]

Aren't you the one selling the 7mm SAUM on the EE and say in your ad you'd basically give your left nut for a 7mm WSM?

Its a complicated situation. Lets say I like the gun, and the calibre more than the cartridge itself. If they made a Montana in 7SAUM i'd be all over it, but the next best thing I can do is a 7WSM. Or keep my Model 7, then I'd have to order an EDGE stock for it, and a timney trigger for it to compete at all with a Kimber. Easier just to buy the Kimber and suffer with the Wizzum headstamp.

Course a 7Wizz Montana is about as rare as hens teeth...which is why I have a .270 WCF Montana sitting in my safe.

I know, I know, its complex, and you old timers just wouldnt understand

 

[1899]

There is an interesting line of medium to big bore cartridges that use a shortened RUM case. They are designed to work in Winchester M70's originally chambered for wsm cartridges.

They look very interesting. Anyone interested in a .458 throwing 500gr bullets at 2120fps out of an 18" barrel?

The .475 is missing from the picture.

 

[.284]

There is a member on this forum that made a 6.5 variant. He called it the 6.5 extreme I believe. Iirc it was sending 140 bergers to about 3100 with low fps spreads. There is some info on it on the net about it if you google it. It may have been on the Borden rifles web site or maybe the Alberta outdoor forum.

 

[blargon]

There is an interesting line of medium to big bore cartridges that use a shortened RUM case. They are designed to work in Winchester M70's originally chambered for wsm cartridges.

They look very interesting. Anyone interested in a .458 throwing 500gr bullets at 2120fps out of an 18" barrel?

Very interesting cartridges, especially the .375...

Loads look decent, although I think I'd go for a 22" barrel...

As you know, I was taking my 375 B&M along to gain some field experience with it. My load for the hunt was 75 grains of Reloader 15 under a 270 grain Swift -A-Frame. This yields 2730 fps average velocity over multiple chronograph sessions. Case expansion is a maximum of 0.0025 inches in front of the extractor groove. The 270 TSX and 270 Hornady SP can reach 2700+ as well.

 

[1899]

Very interesting cartridges, especially the .375...

Loads look decent, although I think I'd go for a 22" barrel...

Take a look at the website; he has quite a bit of load data posted. The advantages of increasing barrel length are so miniscule that they are not worth mentioning - unless you'd do it to reduce muzzle blast.