For 600yds and closer, either the SFP 2.5-10x44mm or FFP 2.5-10x32mm would work well.
The 4-16x50mm, SFP or FFP, would work well also, and give a bit more magnification in case you want to reach out a bit further.
The 6-24x50mm, SFP or FFP, is a good scope with more top end power than you...