270 WSM without a doubt. It is the only one that will take CXP3 class game without shoulder breaking recoil. That said the 338 Lapua mag will be around for a long time to come thanks to the worlds armies, but I don't see it surpassing the 338 win mag for hunters.
270 WSM offers much higher performance they the old 270 win. In the neighborhood of an extra 250 fps. I would call that a notable increase in performance.
I know it is not as popular as the others, but my 7mm WSM has been nothing short of awesome. Loaded with Federals 160 grain Trophy Bondeds, it flat knocks the tar out of anything you would want to kill. I have brass and dies, so no biggy if it doesn't make it. I wonder how Federal's 150 grain Fushions perform? I know the factory cup and core and ballistic tip / silver tip offerings are useless unless you like volley ball size holes! That goes for the .270 WSM as well.
I kind of have a hankering for a .325 WSM as well.
The 300 WSM has already carved out a niche by producing very good accuracy within good velocity ranges. While not as useful for heavy bullets as the 300 Win Mag, it doe shave the advantage of not having the pesky magnum belt screwing up a proper head-spacing.
The 270 WSM has likewise developed a following by displaying consistently high degrees of accuracy.
The 338 Lapua is not really new, and due to military usage , along with lots of publicity, will be around for a long time.
Um, the 338 Lapua is not exactly new. It's lasted quite a while now. As for the others, not many, my personal opinion is that NONE of them will last. They just don't do anything that isn't already being done by an established chambering. This list is a reflection of the 'more is better' mindset. It's the embodiment of the idea that anything with a 'magnum' label is bound to be a top seller. It's a one-hit wonder, the 'my Sharona' of this generation......
I happen to have rifles in 270 and 300 WSM's and 338 Lapua, those are my votes. Not that I really care as I have a lifetime supply of componets for all of em. Yeah, I feel they're going to be around a awhile.
I have little doubt that the 300 WSM is here to stay. That's the only one I voted, but I suspect the 270 WSM and 7MM WSM will be around awhile too. I hope the 270 WSM is here to stay 'cause I just bought one! It will be for me if it's a good shooter, I reload therefore I'll be shooting it.
I think all of them except the .223 WSSM will be around for a while. At least, that is, until they start releasing phased plasma rifles to the general public.
I think the Winchester Short Magnums, namely the .270 WSM and the .300 WSM, will be with us for a while.
And I don't see at least the .300 Remington Ultra Mag going anywhere--up or down--soon. I think it and possibly the .338 RUM are going to stay, but will continue to be niche cartridges.
The 300 WSM has made a home for itself, as has the 270 WSM which truthfully is the only one that filled a perceivable void.
I have a BLR in 300 WSM and it is my favorite hunting rifle. Versatile and the rifle is perfect in weight and balance. Why go with a WSM?... because when i bought the rifle, there weren't any 300 WM or 7mm RM BLRs on the shelf. No particular affinity for it, but it was available, does the job and I'm happy. Simple as that. As a reloader, it could disappear tomorrow and I'm good to go on brass.
The larger WSM's with the exception of the .325 are all well established, the .300 RUM (the rest are honestly pointless... but so is the .300 RUM) is also well established.
Next the .338 Lapua is soon likely to be an official US Military chamber thus nearly guaranteeing success (not that it needs anymore...).
The new Ruger .375 and .416 also fill a useful if low production niche that will see them stick around.
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