7MM WSM or 7MM RSAUM

[700Sendero]

Ok guys, first post here. I'm working on a build for a midweight hunting/long range rig. It will be on a Rem 700 short action with a #3 or 4 contour Hart barrel. I'd like some info on the WSM vs the RSAUM. With the limited availability of WSM brass I'm leaning toward the RSAUM. Will I notice the diff. In velocity? Thanks in advance.

 

[J E Custom]

The WSM has a slight advantage in powder capacity. With that said there is very little difference in velocity and performance. If brass was not so hard to get for the 7 WSM I would recommend it, but
if you can find plenty of 7 SAUM brass go for it. Just Buy several 100 rounds before you commit to a build.

Both the 7 WSM and the 7 SAUM are longer than the 300s so it cant be used for the 7s unless you want to give up some neck length.

J E CUSTOM

 

[AZShooter]

Here is a link which discusses the 7 RSAUM and the 7 WSM.

7mm Cartridge Guide within AccurateShooter.com

 

[700Sendero]

Thanks for the help guys. This pretty much made up my mind to go with the SAUM. Now, does anyone have any idea of velocity out of a 26" tube? Probably will be shooting 162 A-maxs for shooting and 160 Accubonds for my hunting bullet.

 

[Ridgerunner665]

Something else to consider...

The 7mm RSAUM is nothing more than a short 280 Ackley... The case capacity is identical.... Well, that depends on bullet being used, but with 160's... Its within .5 grain.

Brass wouldn't be a worry that way...

Velocity from either is gonna be over 3,000 fps... 3,050 - 3,075 fps I'd say.

My 24" 280 Ackley gets 3,003 fps with 160's seated to normal length (3.34")

 

[Jaxdialation]

RSAUM brass is very scarce. RSAUM was all the rage on another forum. 6 months later the rifles were for sale.

 

[AZShooter]

Bullets.com has NORMA 7 SAUM brass on sale if you are willing to buy 250 cases. (or 2000 )
Or you can pay full price for boxes of 25.

Bullets.com

 

[700Sendero]

I've found 3 different places with SAUM brass in stock and nowhere has WSM brass. That's why I started looking at the SAUM was brass availability. I like the fact that your burning less powder for really close to the same velocity.

 

[Dgd6mm]

Something else to consider...

The 7mm RSAUM is nothing more than a short 280 Ackley... The case capacity is identical.... Well, that depends on bullet being used, but with 160's... Its within .5 grain.

Brass wouldn't be a worry that way...

Velocity from either is gonna be over 3,000 fps... 3,050 - 3,075 fps I'd say.

My 24" 280 Ackley gets 3,003 fps with 160's seated to normal length (3.34")

+1, I have a 7rsaum nitrited barrel, Savage large shank with under 300 rounds down it. I also have a.284 Shehane with 800 rounds down it. When one of these are gone my next 7mm will be a .280 AI.

 

[4bycamper]

Thanks for the help guys. This pretty much made up my mind to go with the SAUM. Now, does anyone have any idea of velocity out of a 26" tube? Probably will be shooting 162 A-maxs for shooting and 160 Accubonds for my hunting bullet.

That's pretty much what I shoot out of my 7 saum Browning, along with 168 vld's.
For a few years this rifle had a 26 inch barrel and I got 2973 average fps with 160 AB.
This load was easy on the brass and right in the accuracy notch. Last summer I shortened the barrel. Now it's 24.5 in. long. And guess what, velocity didn't change. With an Extreme Spread of 24 fps...any velocity change is lost in the ES.

Good Luck with your build. Hope you like it as much as I like mine.

 

[4xforfun]

Something else to consider...

The 7mm RSAUM is nothing more than a short 280 Ackley... The case capacity is identical.... Well, that depends on bullet being used, but with 160's... Its within .5 grain.

Brass wouldn't be a worry that way...

Velocity from either is gonna be over 3,000 fps... 3,050 - 3,075 fps I'd say.

My 24" 280 Ackley gets 3,003 fps with 160's seated to normal length (3.34")

It would be tough build on a short action, don't ya think???

 

[Ridgerunner665]

It would be tough build on a short action, don't ya think???

True enough... But less of a headache in the long run.

 

[4xforfun]

True enough... But less of a headache in the long run.

We have to load the 105 class bullets deep in the 243 Win case to fit in the Rem mag well. You suggest using an even LONGER case with longer bullets in the Rem SA???? lightbulb

 

[Ridgerunner665]

We have to load the 105 class bullets deep in the 243 Win case to fit in the Rem mag well. You suggest using an even LONGER case with longer bullets in the Rem SA???? lightbulb

No.... I'm suggesting sell the short action and get a long one.