Hart barrel chambered in 270 wby

I’m selling a Hart # 5 straight fluted and cerakoted 1-10 twist barrel with radial muzzle brake , rifle was on a stiller action. 
This barrel was chambered in 270 wby and came on my Mcwhorter Rifle and was a absolute tack driver. 
The reason I removed it is because I’ve really become fond of 30 Cals in the last year and this rifle became the donor. 
approx 300 round down the barrel. 
I had the gun smith bore scope it and he said there’s lots of life left in it. 
Can supply load data which was provided by Mcwhorter. 
I am  asking $400 plus shipping for the barrel.