30-06 Man, no big deal.
Dale, it is true that the 300WSM has a little more muzzle vel. with factory loads in 180gr. & under, but it is due to the WSM being loaded at slightly higer pressures as well. With reloads, if you load both rounds to equal pressres, the 300WM edges the WSM & pulls away more with bullets of 180gr & heavier. The 300WM has more powder cap & with a real mag. action like the Rem as opposed to the std. long action like the Ruger, the 300WM can pull away even more with bullets seated out. The WSM is more limited in this regard
with most short actions. This is not a slam to the WSM & it is a good round with good velocities, but it does NOT exceed or even match a properly set-up 300WM. The marketing people talked about effiencty to sell the short mag concept without telling people about the different way they are loaded.
Some don't like the 300WM belted case, but I don't have trouble loading it really. Size it to head space on the shoulder like a beltless round. And if you talk to custom rifle builders, you will find that some of the most accurate Mags these guys build are in 300WM. BTW, the last time I grouped my Sendero at 500 yards, I group was 1.5"(3 shot), I haven't beat that with any of my std. rounds yet!!!
The 300RUM offers more power & I am not against that. It is a good & accurate round, however it does not offer me anything additional that I need, but each person can decide that. I feel that for most folks that look at a 300 mag, the WM has alot to offer. It will always have more factory ammo choices than the WSM or RUM, that is important to me only because I intend to pass my 300 down to my kids & they may not reload like me. My 300 at least because of weight & stock design is still a VERY tolerable round to shoot &
that is a concern to some.
With my Sendero I get 3,160fps with a 180 & 3,000 with the 200gr., the level I was looking for, but all of our goals are different.
Anyway, if you want a rifle for bigger stuff & are thinking about a 300, look hard at the 300WM.