as far as the trajectory goes drop is always predictable. flat trajectory is over rated. i am military and we use 7.62x51 (308) with 200 grain sierra match bulltes for 1000 plus. 308 is all anyone ever needs for deer. although .300 mag is an excellent choice. you will not be disapointed with .308. heavy bullets are slower but also more accurate. go with .308 190 grain berger vld. " just my opinion, it has never let me down."