44o said in response to my findings,"Over my Ohler the 300 win mag factory loads will outpace the 300 WSM 99% of the time with factory loads. like Weatherby factory loads the WSM seldom does as advertised."
LOL So you have now been doing studies on 300WSM factory ammo from all the different Co's and then comparing that with studies on factory ammo velocity from the 300 Win Mag Ammo Co's and your studies show that the Win mag wins 99% of the time.
Horse crap, His 99% theory is nothing but lies, and Laughable at best. i just showed him one example, the only one i looked up but it must be that 1% of the time where the WSM is faster. Right!
440 has a habit here to promote the old favorites he likes. He can smooth talk with the best of them but caution to take whatever he says here with a serious grain of salt!
No doubt the Win Mag is a hoss cartridge but the Shootist, from post #3 above, ran his 300WSM 165 grn. loadings pushing 3300FPS, not from the longer Win Mag barrels but a 24" tube, with no sticking bolts, and fly speck accuracy. The 300WSM can hang in there in any practical sense.
As far as the 270WSM and a 300WIN mag/300WSM combo, nobody here has put down more print on the 270WSM than i have. It's been my "go to" favorite cartridge for years and in a search of the past pages you would find that i maybe even talked about it too much. To me, i don't care for it as a cartridge just for the smaller stuff when looking for a two rifle set-up. I believe that it is way more cartridge than needed for game like antelope and deer. In the end, i sold mine, i other similar rifles and got to where i didn't like setting down and shooting it because of the recoil and accompanying muzzle blast. It might not qualify as a beast but plenty of guys claim it's all they want to handle and i'm in that group. For me, the 270WSM is at the higher end of what i'll hunt with.
If me, i'd go with something comfortable to practice a lot with and still get the job done, like your 257 Weatherby or a 7mm-08 there are many good examples, on medium sized critters. Then you could go the 270WSM, 7MM Rem Mag, 300 mag, either the Win or WSM, as your bigger gun. To me, there's just not a lot of difference between the 270WSM with good loadings and the regular 30 Cal mags. A decent shot with any of them will get the job done on anything i care to shoot.
Anyway, just some more ideas.
Joey
"It's all about knowing what your firearms practical limitations are and combining that with your own personal limitations!"