Which succeed and which fail is really up to you, and let’s hope the cream rises to the top. Survival. The last of these cartridges, the .325 WSM, was introduced in 2005. +1.
Or any other reason to choose one over the other?
Elk hunting usually means long walks in the hills so IMHO, the package means more than the head stamp. The energy for this load, at the muzzle, is 3185 foot-pounds, a nice, neat energy increase of 500 foot-pounds. in bullet weight on the heavy side, and in reality the veloicity is the same all things equel..
Starting to lean 7mm mag. As illustrated in the chart, .270 WSM Winchester Short Magnum rounds - on average - achieve a velocity of about 3240 feet per second (fps) while 7mm-08 Remington rounds travel at a velocity of 2830 fps. Furthermore, the muzzle energy of a .270 WSM Winchester Short Magnum round averages out to 3170 ft-lb, while a 7mm-08 Remington round averages out to about 2450 ft-lb. All information is provided "as is" with all faults without warranty of any kind, either express or implied. I'm thinking the WSM in 24 inch barrel is equal to or better than 7mm in 24 inch barrel. Looking at the availability of brass and ammo, it seems like the old 7 mm Magnum would be a better choice. To put this into perspective, a Boeing 737 commercial airliner travels at a cruising speed of 600 mph, or 880 fps. I’ve used both for elk, and there’s a difference. I'd also go with the 7mm. You can't get all of the performance out of either of them with a 24" barrel. Unless you are independently wealthy and can afford to own one of everything, the obvious choice between these two would be to go with the 7mm - IMO. At most normal hunting ranges any of these will work fine though, people have been killing elk with each just fine. The RCBS , Redding , Lyman are all quality equipment but you are not getting better than Lee.