Based on personal experience V. a. montandoni usually reaches 55-60cm in length. Generally females are longer then males. This year a friend of mine caught a stocky male around 57 cm, but I have found most males within 50 to 55cm. Females are within the 55-60 cm range and only once I have seen a female >60cm (62 if I remember correctly).
Scientific literature tells the same for V. a. meridionalis, generally it is smaller then the nominate subspecies, topping at around 60 cm in length. Still, exceptions are to be found: I know of a male around 73 cm in length and very bulky and there are other such examples.
The fact is that these subspecies generally reach smaller maximum lengths then V. a. ammodytes.

Well, Tiberiu, that is at least strange, as my montandoni from Bulgaria/Romania are easily about 80cm long, maybe even more. I'll take some photos as soon as they digest their food...
Cheers,
Maciej

As I said, there are exceptions. Or maybe in the wild these snakes never get close to their maximum lengths as they don't last that long for various reasons - I really don't know. Anyway I would love to see some pictures of your monsters. I haven't seen any ammodytes that big, no matter what subspecies. The largest was a male V. a. ammodytes at 78cm.

Regards,
Tiberiu!

Okay, not to make garbage in this topic - You can see the nose-horneds of mine and talk about length in this topic - CLICK!
Cheers,
Maciej

Hi,
Thanks for the post, Pierre. I always thought that such sight is just an effect of the light that is usually more powerful on one of the sides of the snakes head... I checked eyes of my meridionalis females with a flashlight and every eye responded well (I think) to strong light. At least that's what I saw. Anyway, they are eating well, so I don't want to worry for now. Time will tell.

Btw. Beautiful viper You have there! Really! :-)

Take care,
Maciej