Guys, this debate.. 7mmWSM vs 300WSM...
I have just had to make this decision. These were my two choices.. and what did I pick. The 300WSM.
The 7mmWSM will shoot flatter, and higher BC bullets. Yes, great out long. But what I am seeing is these guns are loaded warm, which does not help the barrel out, if you know what I mean. Nice short neck, lots of powder being pushed down the smaller bore. I would like to mention too, that my rifle will be shot a fair bit, so this was a consideration for me. If you are only shooting a couple hundred rounds a year, jump straight onto the 7mmWSM.
Now, the reason why I chose the 300WSM. Firstly, more rounds down the barrel before its a tomato stake, but I will be planning on putting a few rounds down the barrel per year. Second, bullet selection. I feel the 30cal has a better bullet selection over the 7mm. In the 30cal range that I plan on shooting, I have Sierra 190, 200, 210's, Bergers 210's, Hornady 208's, and Lapua 185's. The Sierra 200MK's and Hornady 208's will be my first choices.
The other question, is how often will I be taking shots at 1000yds+. Here in Australia where I am, very rarely. So do I need this added performance that the 7mmWSM offers at these long ranges. I think not.
The 300WSM also has brass selection, Winchester, Remington, and Norma. This is more than what is offered by the 7mmWSM.
The components I am using for this rifle are Stiller TAC300, Lilja barrel, PAI brake, Badger M5 metal, NIghtforce, and Manners stock. This combo with a 28" barrel should see me get around 2900fps with the 210's. Thats more than enough for me!
So, to conclude, I chose the 300WSM because of brass/projectile selection, not needing the extra performance because I will not be really shooting past 1000yds (and the 300WSM does fine to 1000yds, see 1000yd benchrest), and I will hopefully get longer life out of my barrel.