I do not think the 4-16 ATACR's are too heavy nor do I think the 5-25's are. The 5-25's are just a little longer and bulkier. Once behind the rifle, none of those things are a concern.
Without question ATACR glass is better than NXS glass.
SHV glass is very very good (same glass as the NXS line) for the price but scope is not near same quality of a ATACR or NXS and it was never designed to be. The only SHV scope I still own is the 4-14x50F1. It is a nice budget scope option.
Im a NF customer and cant commit on the other 3 scopes you asked about. With that said, I have looked through a Kahles 624 and was impressed but not enough I would stray from what I know about NF quality and repeatability.
Without question ATACR glass is better than NXS glass.
SHV glass is very very good (same glass as the NXS line) for the price but scope is not near same quality of a ATACR or NXS and it was never designed to be. The only SHV scope I still own is the 4-14x50F1. It is a nice budget scope option.
Im a NF customer and cant commit on the other 3 scopes you asked about. With that said, I have looked through a Kahles 624 and was impressed but not enough I would stray from what I know about NF quality and repeatability.