even if it was 200-300 FPS< unless you shooting WAY past 500 yards, your NOT getting a noticeable difference really
if your Match shooting every bit helps, but on a hunting rifle set up for average hunting
its splitting hairs, and NOT worth the price to add if NOT in a production set up
or NOT to me
Longer barrels can SOME TIMES help stabilize a bullet, but even that is not a huge deal here
finding a load your rifle likes and shooting it at all distances you would SHOOT at a game animal is the better way to learn and do better at distance! , than relying on a 2 inch longer barrel ever will!
shooting far is all about practice and knowing YOUR limits and the gun's in YOUR hands!