Quote Originally Posted by Parashooter View Post
Interesting question. I have a box of Chileanicon military 7x57 dated 1976. It is loaded with a 138-grain FMJ spitzer bullet. This is a clue but the real answer involves some math.

On my M1912 Chilean, the rear sighting surface moves vertically .26" when raised from 300 to 1000 (meters). Given the rifle's 25.6" sight radius, this corresponds to a difference of 34.91 minutes of angle - reasonably close to the calculated "come-up" from 300 to 1000 meters with a projectile having a BC of .425 at 870 m/s muzzle velocity (2854 fps). This velocity is entirely within the practical span of acceptable-pressure loads from the 29" barrel of the M1912.

By contrast, the old 170-grain RN bullet at a practical 750 m/s (2460 fps) would need a come-up of almost 70 MOA from 300 to 1000 meters. It therefore seems reasonable to assume that my M1912 is sighted for a faster spitzer much like my Chilean military sample.
You're my hero of the day!!

I thought it would be the 138gr pill as most people I've talked to say they've had great luck with 140gr bullets, but I couldn't find anything conclusive. Thanks!