I have a new ar 15 in .223 that I am having a difficult time deciding which scope to put on it. I will mostly be using this gun for coyote hunting and some long range varmint and target shooting. My goal is to have something that makes a 600 yard hit consistently. The scopes I have narrowed it to is the vortex viper PST in either 4-16 or 6-24 or the Zeiss conquest in 6.5-20 with the varmint reticle. I can easily get the Zeiss and found a PST 4-16 ffp today at a local store. Suggestions on if the ffp is worth it? Should I wait to get a 6-24? I know the PST is a difficult scope to get your hands on. Any suggestions are much appreciated.