In order to answer your question, we'd need to know what your rile's muzzle velocity is since bullet drop is dependent upon muzzle velocity and muzzle velocity determines the time-frame in which gravity "works" on your bullet-in-flight to the target.
My reloads (40.8 grains of H4895 w/ a 150 grain Nosler Ballistic Tip bullet) give about the same muzzle velocity as a 150 grain factory loaded round. I'm getting a chronographed 2635 fps average (� 3 fps (+1/-2 fps) outta my EG's 24-inch barrel.
If your rifle and your hand-loads are giving you about the SAME muzzle velocity as I'm getting, then you can use my "numbers" (below). Even if you are getting 50 fps more or less, there wouldn't be enough difference in bullet drop to be concerned about.
Sighted "dead on" the center of a 1" orange paster at 25 yards, the bullet is 2.75 inches high at 100 yards with a maximum height of 2.9 inches above the line-of-sight at 140 yards and "dead on" again at approximately 210 yards and 3-inches low at 250 yards which give me a "point-blank-range" of 0-250 yards.
"Point-blank-range" is defined as the range wherein the bullet never rises or falls more than 3-inches above or below the line-of-sight from the end of the rifle's muzzle out to the maximum range you will shoot.
Therefore, my "point-blank-range" for my rifle and my hand-loads is 250 yards.
I.E., If your bullet strikes your point-of-aim, regardless of the range from the end of your rifle's muzzle out to 250 yards, you will
still easily be within 3-inches (or less) of the point-of-aim and well within a deer's "kill-zone" from the rifle's muzzle all the way out to 250 yards.
As a result, simply sight your rifle in to be in the center of a target paster or the target's bullseye at 25 yards and you're good-to-go all the way out to 250 yards.
Therefore, it's relatively meaningless to know where your bullet is at 70 yards. I.E., don't be concerned about it if your bullet is "dead-in-the-center-of-the-bullseye" at 25 yards.
Naturally, you should check out the bullet alignment at a longer range (100 yards or whatever) if possible to insure you have things "right".
Good luck in your hunting...
Strength & Honor...
Ron T.