20 vt barrel lenght

[20vt]

HI long time viewer first time post.I am building a switch barrel 20 vt.The rifle is a rem 700vssf .223. I have a Lilja 1-12 twist that is the same contour a the rem. varmint barrel.I would like leave the barrel as long as possible which is 27.5 inches .Which after chamber would still have 24.5 inches of rifling,my thoughs are would be esayier to reach 3800 fbs with 32 gr.bullets and not have a hot load in doing so.This rifle will be shot of a bench at paper or at PDogs,for 95% of it life thats why i don;t mind the longer barrel lenght.What do you guys think . thanks 20VT