Your should edit your title...
I built 6.5 x 300 Weatherby's back in 1969.
Like others have said its been around for years. Advances in powders and barrels make it more viable, look at all the available load data most of it h870 which is long since been discontinued. If weatherby's vanguard is chambered in it I could see it doing very well.
Your should edit your title...
I built 6.5 x 300 Weatherby's back in 1969.

Theme to Deliverance plays......seems like a puff your chest out and whip it out to prove who has the biggest one......26 Nosler vs Weatherby.
My thought on this is going back and thinking of one of my favorites...the 308 Norma mag. Along comes the 300 WM in a rifle 1/3 to 1/2 the cost with cheap available ammo. The one that really wins here is the one that allows brass to be available, chambers their rifle in a affordable package, and markets it better. Nosler has the head start, but there rifle is $4000 and brass is nosebleed expensive. If Weatherby allows this out in the Vanguard, coupled with simply necking down 300 Weatherby brass, they would be the clear winner.
Perhaps ask that question in 20 years, by then we will see which WSM calibers actually still commonly survived. The battle of these two would be clear by then. They might actually be more useful if someone comes up with a more useful 160 frangible hunting bullet.
Your should edit your title...
I built 6.5 x 300 Weatherby's back in 1969.
The big downside with the Vanguard and these chamberings (like the 257) is that they don't come in a 26" bbl.
Good point, so we could put a 26 or 28" barrel on and still have $2600 left over from buying the Nosler rifle......or wait 6-800 rounds and replace the barrel with the shot out throat.
I heard 6.5 - .284 is really the way to go for hotrod 6.5's.
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NAA.
H870 rocked. Dirty and hard on barrels but still awesome.
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