7-300 WSM or 7saum

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tilo

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Anybody have any experience with the 7-300 WSM? I am hoping to build one this winter. I have been researching and one of the downfalls to this caliber is necking down the 300 WSM brass and the associated preparation. The other option is to go with the 7saum as brass is available from Norma.

I did look at the 7wsm but given the fact that brass is basically unavailable and the fact it has a short barrel life doesn’t look too appealing.

Thanks
 
Barrel life is no shorter on the 7 WSM than the other two... also, making brass for either from 300 WSM brass is one pass through the dies, all the talk of neck turning etc... proved to be false and/or unnecessary. The first firing blows the shoulder forward... but I found that the fireforming rounds were just as accurate as the second firing. JME, hope that helps.
 
I have dies and a reamer if you are interested. Best reason is that you can use either 270 WSM or 300 WSM brass. Readily available brass as opposed to SAUM brass which is extremely hard to find and expensive.
 
SteveB said:
I have dies and a reamer if you are interested. Best reason is that you can use either 270 WSM or 300 WSM brass. Readily available brass as opposed to SAUM brass which is extremely hard to find and expensive.
Click to expand...

The neck is further forward on the 7mm WSM, so using .270 WSM brass is a two step process, necking up to .308 and then back down to .284 to create a false shoulder to headspace on. Using .300 WSM brass reduces the process by a step, and it only requires a single pass in the 7mm WSM die to create the false shoulder. After the first fireform firing, the shoulder will be blown forward and the reported neck thickness issues do not exist... at least with the Winchester brass I used... the result was excellent brass.
 
...have thought of doing a 7 WSM many times.......so many times that I bought a set of dies, a reamer and 3 boxes of ammo....all still here and no rifle assembled yet...maybe some day..:)

I think it's the best of the WSM's
 
I was looking at a 7-300 Wsm as well but brass was hard to come by (at least what I seen) so I scrapped the idea. I like the longer neck of necking down 300 Wsm as well.
 
I bought a Browning X-bolt in 7WSM back when X-bolts were a new idea and 7WSM was a chambering that had potential to become popular. I can't make my handloads outperform Federal Fusion 150 gr. I can get rounds to be as fast, but not as accurate. Or I can get rounds to be as accurate but not as fast. It shoots 0.75" at 3100 fps (chrony).
Although it's taken several deer, and I've carried it while looking for elk, it doesn't see the field a whole lot. My 300WSM (or my bow) has taken all my elk, and I find magnums to be overkill for deer most of the time. My 300WSM is 1/4 lb lighter for long walks, is stainless steel so sleet and snow is less of a worry, and the 180 accubond at 3080 fps gives me more peace of mind on long shots, so I carry it more on elk hunts than the 7WSM. I like the 7WSM but it is kind of outshone by other rifles I have. I've had it for sale more than once on the EE, but no takers, so it stays with me. The 7WSM is just not popular. It's hard to find the rifle's pet loads, and when I do they're quite pricey. I have 5 boxes of the Fusion ammo, and when those run out I'll have to find a home-load that I like as well. I've had some promising results with the 154 SST, but the Interbonds are terrible. Lucky for me I have quite a lot of brass.
 
Unless you really need a bullet heavier than 150gr, just get a 270 WSM!
It's an awesome hunting cartridge and the main reason why better 7 WSM is going nowhere.
 
Finding 7mm WSM ammunition and components has never been an issue for me, I just keep an eye out for factory ammo at a good price and keep the brass. Annealing the necks after the first firing seems to help greatly with case life as I find sometimes the necks crack after a couple of firings if you don't do this...

If you're going to look at a wildcat based on a 300 WSM I'd be doing something like a 6.5-300 WSM.
 
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