I have just started reloading for a win 375 with 20 in barrel. I chose aa2015 powder and I can only get enough in the case to get 2100fps. Accurate reloading manual shows their 1680 powder getting 2512 from a 24 in barrel but factory winchester ammo advertises 2200 fps(unknown barrel length) so what I am wondering is if I get 1680 powder would I get enough extra velocity with good accuracy to make it worth keeping an extra powder around. I almost forgot the bullet I am using is the Sierra 200gr fp.