OP, word of caution, stay away from the Mark 6 3-18x44 (it's issues have been well documented on this site and elsewhere), if you'd really like Leupold I'd recommend looking into the new Mark 5HD 3.6-18x44 as it appears to have resolved a lot of the Mark 6's issues (but we'll have to wait and see). Also, given your budget, I'd highly recommend the Vortex AMG. You might not have considered it being a 6-24 but it has a generous FOV at 6x (20.4' @ 100 yards) which is my limit for a big game scope. I hunt elk mostly and my limit is based on whether or not the critter can fit inside the FOV of the scope at bottom magnification at 50 yards and most elk can easily fit inside the 10' FOV of the AMG, smaller critters even better. If the game is closer than 50 yards I don't really worry about it, that's why I carry a big knife with me
. I would also highly recommend the Bushnell ET LRTSi 4.5-18x44, not as good as the AMG but for about 1/2 the price its performance can't be beat. I also own a Vortex PST II 5-25x50 and while not as good as the LRTSi (and obviously the AMG) it is a great scope for the price, the diopter was more finicky than other scopes but once I got it dialed in properly I was really impressed. My only other thought is to look for a used Premier LT 3-15x50 and even the used Tangent Theta TT315M (the clone of the Premier LT) have gone for under $2500 in the classifieds, you will never look through better glass than Premier/TT in this magnification range. I know you'd like to stay under 18oz but you're just not going to find that in a FFP scope greater than 15x. Also, Tangent Theta just came out with their hunting oriented scope, the TT315H (see this thread -
https://www.snipershide.com/shooting/threads/tangent-theta-h-series.6868797/) but not sure how much it will be or how much weight savings it will have over the TT315M.