I agree with ChileVerde that seat height is going to make a greater difference in the ease of handling and maneuvering the bike then a few pounds, especially for a 5'7" beginner. A lower bike is going make it feel lighter in use. While heavy for what it is, the crf250f has a relatively low seat height and should have a very mellow and easy to use power delivery, low gearing, good reliability, low maintenance etc... and looks like a great option for casual riding and getting from A to B hunting (I haven't actually ridden one).
Something from the KTM EXC line-up (or a similar model from Beta, etc...) will be a much more capable motorcycle if you intend to get serious about recreational trail/enduro riding. Lighter, faster, better suspension and chassis, better brakes, more durable if ridden hard, etc... At your height you would probably want to lower the suspension (which is easy to do) as they are quite tall from the factory. The lower ride height will more then make up for lost suspension travel (which would still be more than a stock crf250f). They are of course much more expensive and higher maintenance than the crf250f. Even once lowered 2" to mach the ride height of the crf250f I don't think they would be any easier to use for hunting purposes than the crf despite the lower weight but they would be better for serious riding.
More motocross orientated bikes from any of the big names will be lighter but can have a difficult power delivery for beginner trail riding or hunting, stiff suspension, high maintenance, high ride height (they can be lowered) etc.. and I wouldn't recommend.
If possible I would try to ride one of your buddies crf250f's and see what you think.