I am not sure on yield but the last on taken here on our place, weighed 298#s on the hoof.
I think thats above average most are 200lb-250 on hoof for mature buvk that ive encountered.
I've shot two mature axis bucks in Rockspring, TX. Both weighted around 175-185 lbs. As far as meat yield, just taking the BS, hams, shoulders, tenderloin, flank and some neck meat was probably around 45#'s of deboned meat.