I gather you aren't buying from a registered breeder? I'd call 7 weeks less than ideal. The primary lesson pups learn from each other is bite inhibition. s you have no doubt already learned, gundogs can be very mouthy and bite inhibition not learned on siblings will have to be taught by you.
Have the parents of your pup been hip scored?
With our first puppy, Kobe... when he was about 9-11 weeks he became quite "snappy" and was biting at everything. He grew out of it/we taught him it wasn't ok and it's now a non-issue.