if you had a rifle that was going to get a new barrel and had a choice between these two which one would you pick and why....advantages/ disadvantages if there are any

I'd look at brass availability and quality as the biggest difference. Norma makes SAUM and Hornady just started making WSM. I know the Norma is good, don't know anything about the Hornady.

What rifle and mag box length?

ultra light arms...3.00 inch mag box

7 WSM

SAUM.
Does everything you need it to do. Brass is available from Norma which means it is very good quality. Slightly shorter case length helps with balancing handloads with overall length and jump/jam of VLD bullets in a typical box magazine.

WSM.
Does nothing more than the SAUM, but uses more powder to do it. Brass is unavailable, except maybe from Hornady, which is fairly poor quality. Quite long case length (longer than even the 300 WSM) hinders use of VLD bullets in a typical box magazine.

I reckon 7mm SAUM is likely to outlast the 7mm WSM if only down to the wildcats being built from it.

I have one of each, the 7wsm is getting 3070fps with 180 eldm 23” Barrel
7 saum is getting 2980 fps with 160 accubonds 22” Barrel
Of the two with Norma 300 wsm brass available don’t take much to make7mm wsm.

My pick would be 7wsm.

7mm WSM !!!

7 Saum

WSM

6.5 PRC 😉

WSM

7 RSAUM will handle all the hunting you will ever do.

I have hunted with nearly every 7mm. My preference is the 7 Wby.

WSM brass is far more available than the orphaned RSAUM, and the WSM case takes best advantage of a 3” magazine... some of the newer powders turn the WSM into a beltless, SA 7mm RM.

But I have no use for either

Because you prefer your 308, right?

Yes!

But I do have a 300 WSM.

The SAUM, without a doubt. Brass is very easy to find.

WSM...

WSM... not tough to make brass out of 300 WSM...

Saum

Ha 280AI and don’t look back

Having had both, I'll be doing another SAUM when life allows.

I've seen the reports of Hornady making WSM brass, which doesn't excite me the least bit after the last couple weeks loading their 6.5 SAUM offering.

Hate to say, Hornady brass is sub-par.

Saum, Its more loved by the target community which means it will likely hang on longer.

On a 3" box, I'd go 7 WSM and build it around 300 WSM brass necked down with false shoulders, no neck turn.

Brad is, The reason the left wins against hunters over and over. So take the [bleep] word whit a grain of salt and a bunch of GFY.

I like the 270 WSM more!

Which makes zero sense....

And don't expect any sort of rationale.

Cuz there is no rationale.

There isn’t a lick of difference on game between all three.

There may be a difference in other things, such as availability of components or factory ammo, but nearly all of those would favor the .270 WSM except for all the bullets available for the 7MMs. They won’t kill any better than existing .277 bullets, though.

I kinda like The 7mmwsm with 180 eldm at 3070 but if half the wind drift at 500 over a 270 wsm with the best bullet offered is the same then you have this figured out.

Still waiting for the nxs3-15 so I got bored and put a b-1o on order in Moa as well I will let you know how I like the two.

Dang man maybe I am babying my 7 WSM. I got a 26.5" barrel and settled on 3080 fps. Went up to 70 grains of 26 and got well above 3100 fps but since 7 WSM win brass is like unicorn tears I was hoping to get some extra firings out of it of course now that Hornady is selling brass for it maybe I should just say screw it and hammer down.

Either way I do dig the way it bucks the wind. I need all the help I can get in that regard.

Not in 7 mm.

Absolutely agree that 7mm has way more bullets available, especially at the heavy end of the spectrum. The .270s simply cannot compete there.

That seems like a rationale to me.

Bullet availability and BC are pretty big deals....

I'll have to disagree, I said "far more available"... Right now I can go to the local GS and buy Winchester, or Hornady in 7mm WSM, or order Bertram. Winchester and Hornady are pretty affordable.

7 SAUM is available from Remington (good luck finding it) Nosler and Norma (expensive options), none of which are available to me locally, and I live in one of the nuttier gun nut corners of the globe.

I actually prefer the design of the SAUM over the WSM, but in a 3" magazine I'd still lean to the WSM. I believe it's available on more shelves, and it certainly has more gas if 75 fps means anything.

Key words "right now." That's the only reason Hornady's recent introduction of 7WSM brass was noteworthy.

Yes and no.

For performance on game at hunting distances, BC superiority rarely gets a chance to show itself. And there isn’t exactly a dearth of .277 bullets ..... there are plenty and the vast majority of them are hunting bullets rather than match bullets, which make up the bulk of the heavy, high-BC 7mm bullet selection.

Of course, it’s more of a philosophical decision and we all have our own beliefs. For hunting, I personally would take the shorter flight time, better trajectory and proven penetration and bone-breaking ability of a 140 TTSX over a 180 ELD-M with nary a thought. Since there is nothing a 7mm 140 TTSX can do that a .277 130 TTSX cannot, there is no rationale for choosing one over the other based on performance on game or availability of good hunting bullets.

For punching paper at 600 yards and beyond, the heavy 7mm match bullets obviously have an advantage. Those bullets don’t have to (and aren’t designed or expected to) bust the hip and off shoulder when the only shot presented is the south end of a north-facing bull elk.

What is a hunting distance?

Subjective?

Better be close or those two things apply. If it is, why you need a WSM anyway?

In 42 years of hunting, my farthest shot on game is 435 yards. It also happened to be on the largest game animal I’ve ever killed, a massive 6pt bull elk that had to be near 1,000 lbs on the hoof. Taken with an impressive, lightning bolt DRT with a 125 NPT fired from a pet 700 custom job in 6.5x284. Only one other critter at 400 yards, a 14” Pronghorn buck taken with the same rifle and a 120 NBT.

My largest deer, a great 4x4 Mulie, happened at 385 yards with my .270 Weatherby Magnum shooting a 130 NPT. Everything else has been between 30 and 300 yards.

I guess for me, “hunting distances” means out to about a quarter mile, or so. I can’t imagine it’s much different for anyone else, and more than likely much shorter for most. The only exceptions I’d imagine would be those who actively seek to shoot animals at long range as a hunting style.

That’s RL 26 at 65grains in a 23 1/2” Obermeyer 1-8twist. Brass is federal it’s heavy compared to the Winchester stuff I have.

A 1/8” 270 WSM wouldn’t exactly suck. I wouldn’t choose it over either 7, but 145 ELD,150 VLD and the 170 EOL ain’t exactly ashtrays.

I used the 170 in a 270 win this year on a deer, tad over 600 yards.. first time I’ve used the 270 in 10 years.

How fast are you pushing the 170 eol.

2730 matches up with ballistic AE. RE26, 22” barrel

never chronographed that one,not a bullet I’ll continue to use in the win; I just wanted to shoot something with them and my 270wby wont stabilize them.

Copy that I got a 270win with a lilja 1-10 shoots 140 and 150 very well but she would not stabilize that 170 on top of Everest.

Thank you sir!! I must have a slow barrel or yours is speedy. Either way a 180 ELDM going 3050+ doesn't suck I just apprently need 3 more grains of powder to get there than you do.

My barrel is very very fast I could not be happier.

For sure...luckily RL26 is so dense that even with 3 more grains its still not even close to a compressed load and still room to work up. Thanks for the info!