The Ballistic Plex Reticle is calibrated for 9x on the 3-9x scope.
What ranges did the hash marks end up as zero ranges for you at 4.5x?
Why would you set the scope on 4.5x, especially if you are going to shoot at game at extreme ranges like 450 yards?
I have no use for a 10x scope inside 200 yards, either, (open sight range). That is why I suggested a 6x set at 200 yards.
But I said, if you plan to shoot at 300 or 400 yards (I have no need, but the thread is about 300 to 400 yards), that 10x is better. 10x works out well with Mil-Dot and target knobs incremented in radians to match. That is the reason US military snipers use that.
Turning the knobs on a 10x tactical scope is just as fast as using the BP reticle, faster than if you have to stop and use note cards or a separate range finder.
As several other posters have noted, it is easy to set up your .270 or .30-06 so you don't have to do anything more than hold on hair and shoot out to 300 yards, which covers 95% of ethical shots, anyway. Use a ballistic reticle or knobs for the other 5%.
