A Physics Lesson

Unless you know *which* .303 British ammunition your sight graduations are for, you're out of luck.

Over the years the Brits changed the bullet weight and velocity of the .303 several times. The trajectories varied quite a bit.

As for SAAMI or CIP spec hunting ammo... who knows.
 
It should be recognized that for long range shooting the bullet will cross the line of sight twice, once on the way up and again on the way down. At the latter point, if the rifle is sighted in properly, the bullet may impact the target and stop or continue past/through the target. This is taken advantage of in military training where it allows rifles to be sighted in at short range and retain the same sight setting at hundreds of yards.

Jim
 
My 308 starts about 2.6 inches below line of sight crossing los at about 50y the arc peaks 6 inches above los then drops crossing los at about 330y and ends up 6 inches low at 500yards.
so I am within 6 inches of los from the muzzle to 500 yards.
so aim center mass and rock and roll
No guess work until well after 500y then hold over
 
Which is the logic behind the 1903 Springfield Battle Sight, a center hold on a man would hit him somewhere out to 500 meters, 547 yards.
 
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