Hey char . WELCOME to GB ! Tim , Slufoot & wood gave you the straight stuff. Get a big piece of cardboard, put a red dot on it, shoot both bullets @ the dot & you'll know the answer for your gun.
But in case your like me , 150 miles from the range & are trying to "glean" some information from this "thread" , I'll offer some help. Rem Shoot (tm) sighted in @ 25yds has your 300 @ -.18" & your 405 @ -3.74". The Hornady (tm) site, Ballistic Resource Calculator has your 300 @ -.2" & your 405 @ -3.7", all @ 100 yds. These are free to all of us but are "very rough" estimates.
As time goes on , like me , you'll learn how to phrase these questions .
Your being "initiated" by the rest of these jerks !
Good Shooting Jim