Need Some Good Dope! (for a friend)

[teflon6string]

Got my own numbers ("dope") basically sorted out for .223 and 5.56 zeros at 36/300yd and 50/200yd. Close enough to put nice groups on paper near and far. Still deciding which I like best.

Got a buddy who's no slouch with pistols, but he's kinda new to rifles with red dots. I'm hoping to help him lob a few rounds and get his new gun into the neighborhood of dual zeros, But his hardware is significantly different.
- 9mm, 16" barrel (Ruger PC carbine)
- Pronounced parallax with an optic axis perched 3-3.5 inches above the bore
- Way different velocities/trajectories

Yikes!!! I don't know what's realistic for a setup like that! We both know he's not going to get the same performance (perhaps not even close).

Anyone been down this road with a 9mm carbine and have some basic distances to share as a starting point?

Thanks for whatever you can share.

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[osprey]

If you take a 124 gr projectile going 1400 fps out of a carbine and zero at 25 yds it will be point and shoot out to about 125yds. The corresponding far zero will be right around 100yds. Beyond 125yds the bullet will not have enough energy to do much so I would keep the zero ranges practical.

 

[teflon6string]

If you take a 124 gr projectile going 1400 fps out of a carbine and zero at 25 yds it will be point and shoot out to about 125yds. The corresponding far zero will be right around 100yds. Beyond 125yds the bullet will not have enough energy to do much so I would keep the zero ranges practical.

That's the ticket! We scoped him in to make a nice tiny group at 25yd (all touching). Which worked out to just 4-5" low at 125. Both practical distances for that weapon.

Thanks.