It's right click shotgun attack has been nerfed severely, I'd recommend focusing on melee and stam to make sure you can gun down everything in sight, because at close range it does not have a reliable melee attack anymore, other than its very weak claw attack. Be careful as a group of Allosaurus can get rid of your newly tamed velo if you aren't careful.
Melee does nothing for turret mode, however increases needle damage when ridden. Will shred anything you aim at.
Has a short range, but a spyglass can be used like a scope.
The attack where it spins around firing needles shreds large dinos.
What you want to do is tame a male and a female (high levels of course) then have them mass produce. When you have about 10-15 set pump them all into melee and stam and have them wander around the base. And have then on nuetral. So that way the next person to raid you will crash once all of the velonsaurs start shooting