I'm replacing the sporter factory bbl on my Mod 70 Classic ( 270 WSM) with a Krieger BBL chambered in 7MM WSM. Bruno Shooter supply has a Krieger 7MM bbl in stock. Its listed as 7MM 1-8.5 tw #17 HV @31" That's the twist I want. Can a gunsmith turn that size bbl down to heavy sporter ? I want a 26" bbl. So is this the correct bbl to have shipped to my gunsmith