Your first two questions are frankly not worthy of answers.
The third is borderline, but I'll give you a break:
With identical bullets, 400 fps more velocity flattens the trajectory enough to be meaningful, not to mention increasing the bullet's killing range.
Neither of these factors are important to a man twisting turrets and poking holes in paper or ringing a gong.
They make a difference to a hunter.
You have got to be kidding me! Another [bleep] retard Texan on ignore.
I don't use the "ignore" feature. Reading posts from idiots is sometimes entertaining.
I just put the little magnifying glass next to their names to remind me that the poster is prone to idiotic posts.
They are free.
You have one on my screen.