go pro collars? any experience

The Southern Style is the way to go...they make a cut collar specifically for the go pro.

The cameras ain't bad once you figure them out. If you put it on a loose dog you won't get good video.....10-15 feet looks like 30-40 and you won't be able to see the hog good.

Putting them on a catch dog ain't very good in my opinion...just bunch of shaking blurry video while the cd is running then when he catches it's up close video and you can't see anything.

I got the best results putting it on a tight baying (4-6') dog that will sit one down. Lots of good footage.