@ 06:55 pm (GMT)
Thomas Kitchenhi russell.
i just fitted a bigsky 4-16x42 to my tikka, i don't notice the turrets getting caught on anything didn't even really notice the extra weight.
the extra zoom of the 16x is very helpful specially if you do want to extend your ranges. not sure you would notice any difference between 3x and 4x at the bottom end but a lot of scope choices are personal choice for your type of hunting.
they must be waterproof with caps off otherwise they would leak gas like you say but you wouldn't want to much water and debris getting in there clogging stuff up. have a look at this if you want