I am new to reloading and just got done loading my first rounds. I used a Lee challenger press kit. My load data came from sierra load manual. My particular load is .270 135g match king, norma brass, h4831 sc and cci 200 primers. The recipe is 55.7g of powder and c.o.a.l is 3.340. Everything has been double checked. My rifle is a weatherby vanguard 24" 1-10. The manuals test rifle was 26" and the same twist. I take it I will lose a little velocity with the shorter barrel? 3.340 is a good bit higher oal than some other rounds that I have bought and shot. I just wanted to double check that I am running in the safe zone. Set my mind at ease for my inaugural testing please.