I have both my 7mm Rem's sighted in at 1" high @ 100 yrds. Using a 140 gr bullet that gives you dead on at 200 yrds and 3-4 " low at 300.
I must ask as to what velocity your guns are producing with that 140gr bullet and what the ballistic coefficient is for that 140gr bullet.I am not one to put blind faith in trajectory calculations,but using the 140gr ballistic tip,the calculations require a muzzle velocity of 3550fps to 3700fps to be only 3" to 4" low at 300 yardswith a sight in of 1" high at 100 yards.Using a muzzle velocity of 3200fps the calculation shows a sight in of 1.2" high at 100 yards will produce a 200 yard zero and will be 5.7" low at 300 yards.