Finn is right around 50 lbs. at the year mark. He'll probably gain another 8 lbs. or so, over the next year, to year and a 1/2.
Of the three males I've owned one was around 55lbs. Another just at 50lbs, and one at 60lbs. All were big enough to carry a downed pheasant.
What's that saying, "dynamite comes in small packages".
Some of the non US bloodlines, or recently imported bloodlines can have a heavier bone structure. So naturally they would weigh a little more.
Some of the US breeders, have bred Vizslas to be able to compete with English pointers in the field. That has led to some boodlines weighing less than others.
And I agree with Gunnr
Those pocket rockets can really cover some ground, and I'm in heaven watching them. They do kind of freaked my husband out. He's always telling me I should call them in, and I tell them it's fine.
I’ll add a data point to this I suppose. I feel like my boy hasn’t really grown much larger since 7 months old. He is now 13 months old and around 55 lbs. he grew rapidly before that though. Not sure if he’ll grow more.