OAL difference between factory loaded 9mm FMJ

[Warpt762x39]

I was looking at some of the 9mm ammo I've stockpiled for my upcoming XDM purchase and I noticed something different about the Remington ammo I bought.

Turns out it's loaded to a shorter length than either the Federal or the Winchester White Box I have. All of them are 115gr FMJs but the Remington is obviously shorter length than the others. Anyone know why there would be such a big difference in the length of the loaded rounds?

Remington on the left, Winchester White Box on the right.

DSCF7301.jpg

[max384]

Different manufacturers use different powders for the same projectile. Some powders work better with a shorter OAL, others work better with a longer OAL. Suffice it to say that the manufacturers do extensive testing to find the best powder/projectile/OAL combo for the greatest number of guns.

[Flash]

Plus the shape of the nose of the bullet is diffeerent. Ogive curve differs, you can even see it in your picture.

Flash