FNG - whatever scope you use, make sure it will focus to the range that you are wanting to use as a reduced range. As an example, the 10x M3A will only focus to 35 meters, so setting targets closer than 35 meters will produce not only parallax problems but a fuzzy ball of s**t that you are trying to obtain a precise sight picture on your point if aim. Makes it somewhat of a PITA to shoot accurately in that manner. If the scope is a fixed focus, then you will have problems as the focus is usually at 150 yards, but can be anywhere from 100 to 250 yards. Again shooting at ranges closer will produce parallax and fuzz ball problems.
Some more things to think about.
__________________
Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard.
Experience is what you get right after you need it.
Author unknown.