Hi there and welcome to RTB!!
As far as Mack's are concerned, as babies they are quite nippy. But if handled on a regular basis they will eventually grow out of that and tame down. If nippy as adults they have a habit of grabbing on and 'chewing'. I hear it's quite painful, but you should be able to care for that at home by washing it with a good anti-bacterial soap. All snakes bite differently. Some latch on and chew (like the Mack's) and others just give a quick strike. Those are the ones that are more scary than painful. I will be honest and say that I have not been bitten yet, knock on wood, but I've heard plenty of stories LMAO. With large boas the bite is painful two-fold. First from the teeth and second from the impact. They hit so hard and fast that you'll more than likely get a bruise from it. Larger pythons, such as burmese and retics will leave gashes and you'll need stitches if bitten by a juvie/adult.
I am no expert on any of this, I'm sure others with more experience will be along to add their $.02. But in the mean time, check out
Liasis.net and you'll find more info on Macklot's (liasis mackloti mackloti). [img]modules/Forum/images/smiles/icon_wink.gif[/img]
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"If love was a choice, who would ever choose such exquisite pain?"
- Tuptim, King's concubine from Anna and the King