I use a 6x42 on several different rifles that I hunt coyotes with. They work well for me and most of my hunting is woods and broken field/wood lines. I've shot a lot of hard charging dogs but wait on them to stop before I shoot...I usually won't pull the trigger with a rifle until one stops. Most of the time they will stop for a split second before they reverse course and that's the time to nail them...but you do need to be able to pick them up and follow them ready for the stop. They are what I'm used to and I've not had a problem with them yet...all the below are with fixed 6's:

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