Thank you Kelly. I do want a big boy. So you're saying the F3 boys are noticeably larger than domestics and usually larger than F4 and below?
That is not necessarily true...you really need to look at the kitten's parents and lineage...my F6 SBT is larger than most F3's and many F2's. There just is no guarantee on size...talk to breeders, look at kittens and you should be able to find what you are looking for.