Hope this is the right place to start this question. I have a DPMS AR 10, .308. I plan to use this weapon in a Law Enforcement capacity. Have been happy with the purchase of this weapon to date, (had it about 8 mo. now). My problem is, I screwed up and bought the wrong scope. I purchased a SightMark 2.5-10x32 Triple Duty that is in the 2nd FOCAL PLANE. I have since learned that I should have gone with a FFP scope. I plan to use a MilDot reticle. After looking at the many options of FFP scopes I have learned that I don't have the $1,000 dollars or more to purchase one at this time (Deputies don't make a lot of money). I know that the scope's true milradian value is set at 10x. How will this work with close range shots and how close can a 10x scope setting be used? This is a scope that I will have to use for a while until I can afford the proper scope needed. I would also appreciate knowing what would be a good scope to purchase when I can afford to make that transition. Oh, using a 168gr. BTHP Hornady. Thanks for all comments and suggestions in advance.