No, this is standard physics you fool!
Naismith's rule, for every degree of varation each kilometer out will result in 1 kilometer away from the target in the other axis.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Gûá
. . . . . . . . . . . . . . . . . . . . . . . . . . . . Gûá
. . . . . . . . . . . . . . . . Gûá . . . . . . . . . . . . . . . . . . . . . . . . Gûá
. . . . .Gûá X
. . . . . . . . . . . . . . . . Gûá A . . . . . . . . . . . . . . . . . . . . . . .Gûá C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . Gûá
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gûá B

Assuming the Rail Rifle is situated at point X, a player strafing between the points at distance A will be as easy to track as player strafing between the points at distance B, meanwhile the player strafing between the points at distance C is even easier to track since the effects of parralax make it require less aiming.

You have now been educated

It's like that with every weapon, it's called dispersion, we complained because just pointing little dot at person is so easy it makes TTK too low. How about instead just ignoring what people are telling you.
Learn that your super-scrub-chop-strafe doesn't work at range and consider using some intelligence and initiative to counter instead of just whining because your game breaking tactics don't work.

If you don't like it go back to COD, you'll find the ranges of every engagement to be perfect for a chop strafer like yourself.