I have found for me that it's not always live weight that matters. Here's an example.
 
I own NZWs mostly. They tend to hit 4lbs at 10-11 weeks. This isn't "bad" but it's not the 5lbs I'm always told they "should" be.
I also own a rex that I cross to my NZWs so I can get different colors of fur because I'm all girly like that. My first litter of rex had two boys that reached 5lbs in 11 weeks.
 
When I dress down my NZWs I get some INCREDIBLE dressage ratios. This sounds crazy but I have dressed down a buck weighing just under 4lbs to just over 3lbs of meat not including the edible organs. Throw the kidneys and liver in there and that's an 82% dressage ratio. It's unprecedented. Some people have told me it's impossible, but it happened. And my kits regularly get 3lbs carcass out of a rabbit around 4lbs.
When I dressed down the rex crosses they were 5lbs live weight, but only 2.8lbs dressed, no organs. That's not very good at all. It's just over half. I put the same amount of feed into those rabbits, and they got bigger, but I got less meat out of them too, total. They weighed a whole pound more but dressed out to a few ounces LESS meat.
 
So keep in mind; what is it your rabbit puts their growth into? In the case of my Rex crosses, their skin and coats are incredible and thick and should be amazing for tanning. In the case of breeds like Giant breeds, it's mostly bone. In the case of breeds like Palominos, almost ALL of the feed goes into meat. In the case of NZWs and Californians it can actually go either way. Some will dress down terribly because they were from fur or show lines, some will dress down incredibly because they are from strong meat lines. Both breeds are bred for a few different purposes.
 
So ask the breeders if they eat their rabbits, what sort of dressage rates they get and how big they get within 10-12 weeks. Look at the rabbits and feel them for HEAVY muscle and low fat. They should weigh more than they look like they do when you pick them up, and it should be SOLID and TIGHT, not loose and mushy. That's going to be a better meat rabbit than ones that are soft and squishy and cuddly.